net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #include <linux/errno.h>
  42 #include <linux/types.h>
  43 #include <linux/kernel.h>
  44 #include <linux/socket.h>
  45 #include <linux/sockios.h>
  46 #include <linux/net.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/net_namespace.h>
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/if_tunnel.h>
  79 #include <linux/rtnetlink.h>
  80
  81 #ifdef CONFIG_IPV6_PRIVACY
  82 #include <linux/random.h>
  83 #endif
  84
  85 #include <linux/uaccess.h>
  86 #include <asm/unaligned.h>
  87
  88 #include <linux/proc_fs.h>
  89 #include <linux/seq_file.h>
  90 #include <linux/export.h>
  91
  92 /* Set to 3 to get tracing... */
  93 #define ACONF_DEBUG 2
  94
  95 #if ACONF_DEBUG >= 3
  96 #define ADBG(x) printk x
  97 #else
  98 #define ADBG(x)
  99 #endif
 100
 101 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 102
 103 static inline u32 cstamp_delta(unsigned long cstamp)
 104 {
 105         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 106 }
 107
 108 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 109 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 110 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 111
 112 #ifdef CONFIG_SYSCTL
 113 static void addrconf_sysctl_register(struct inet6_dev *idev);
 114 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 115 #else
 116 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 117 {
 118 }
 119
 120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 121 {
 122 }
 123 #endif
 124
 125 #ifdef CONFIG_IPV6_PRIVACY
 126 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 128 static void ipv6_regen_rndid(unsigned long data);
 129 #endif
 130
 131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 132 static int ipv6_count_addresses(struct inet6_dev *idev);
 133
 134 /*
 135  *      Configured unicast address hash table
 136  */
 137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 138 static DEFINE_SPINLOCK(addrconf_hash_lock);
 139
 140 static void addrconf_verify(unsigned long);
 141
 142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 143 static DEFINE_SPINLOCK(addrconf_verify_lock);
 144
 145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 147
 148 static void addrconf_type_change(struct net_device *dev,
 149                                  unsigned long event);
 150 static int addrconf_ifdown(struct net_device *dev, int how);
 151
 152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 153 static void addrconf_dad_timer(unsigned long data);
 154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 155 static void addrconf_dad_run(struct inet6_dev *idev);
 156 static void addrconf_rs_timer(unsigned long data);
 157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 159
 160 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 161                                 struct prefix_info *pinfo);
 162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 163                                struct net_device *dev);
 164
 165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 166
 167 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 168         .forwarding             = 0,
 169         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 170         .mtu6                   = IPV6_MIN_MTU,
 171         .accept_ra              = 1,
 172         .accept_redirects       = 1,
 173         .autoconf               = 1,
 174         .force_mld_version      = 0,
 175         .dad_transmits          = 1,
 176         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 177         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 178         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 179 #ifdef CONFIG_IPV6_PRIVACY
 180         .use_tempaddr           = 0,
 181         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 182         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 183         .regen_max_retry        = REGEN_MAX_RETRY,
 184         .max_desync_factor      = MAX_DESYNC_FACTOR,
 185 #endif
 186         .max_addresses          = IPV6_MAX_ADDRESSES,
 187         .accept_ra_defrtr       = 1,
 188         .accept_ra_pinfo        = 1,
 189 #ifdef CONFIG_IPV6_ROUTER_PREF
 190         .accept_ra_rtr_pref     = 1,
 191         .rtr_probe_interval     = 60 * HZ,
 192 #ifdef CONFIG_IPV6_ROUTE_INFO
 193         .accept_ra_rt_info_max_plen = 0,
 194 #endif
 195 #endif
 196         .proxy_ndp              = 0,
 197         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 198         .disable_ipv6           = 0,
 199         .accept_dad             = 1,
 200 };
 201
 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 203         .forwarding             = 0,
 204         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 205         .mtu6                   = IPV6_MIN_MTU,
 206         .accept_ra              = 1,
 207         .accept_redirects       = 1,
 208         .autoconf               = 1,
 209         .dad_transmits          = 1,
 210         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 211         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 212         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 213 #ifdef CONFIG_IPV6_PRIVACY
 214         .use_tempaddr           = 0,
 215         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 216         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 217         .regen_max_retry        = REGEN_MAX_RETRY,
 218         .max_desync_factor      = MAX_DESYNC_FACTOR,
 219 #endif
 220         .max_addresses          = IPV6_MAX_ADDRESSES,
 221         .accept_ra_defrtr       = 1,
 222         .accept_ra_pinfo        = 1,
 223 #ifdef CONFIG_IPV6_ROUTER_PREF
 224         .accept_ra_rtr_pref     = 1,
 225         .rtr_probe_interval     = 60 * HZ,
 226 #ifdef CONFIG_IPV6_ROUTE_INFO
 227         .accept_ra_rt_info_max_plen = 0,
 228 #endif
 229 #endif
 230         .proxy_ndp              = 0,
 231         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 232         .disable_ipv6           = 0,
 233         .accept_dad             = 1,
 234 };
 235
 236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 241
 242 /* Check if a valid qdisc is available */
 243 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 244 {
 245         return !qdisc_tx_is_noop(dev);
 246 }
 247
 248 /* Check if a route is valid prefix route */
 249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 250 {
 251         return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 252 }
 253
 254 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 255 {
 256         if (del_timer(&ifp->timer))
 257                 __in6_ifa_put(ifp);
 258 }
 259
 260 enum addrconf_timer_t {
 261         AC_NONE,
 262         AC_DAD,
 263         AC_RS,
 264 };
 265
 266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 267                                enum addrconf_timer_t what,
 268                                unsigned long when)
 269 {
 270         if (!del_timer(&ifp->timer))
 271                 in6_ifa_hold(ifp);
 272
 273         switch (what) {
 274         case AC_DAD:
 275                 ifp->timer.function = addrconf_dad_timer;
 276                 break;
 277         case AC_RS:
 278                 ifp->timer.function = addrconf_rs_timer;
 279                 break;
 280         default:
 281                 break;
 282         }
 283         ifp->timer.expires = jiffies + when;
 284         add_timer(&ifp->timer);
 285 }
 286
 287 static int snmp6_alloc_dev(struct inet6_dev *idev)
 288 {
 289         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 290                           sizeof(struct ipstats_mib),
 291                           __alignof__(struct ipstats_mib)) < 0)
 292                 goto err_ip;
 293         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 294                                         GFP_KERNEL);
 295         if (!idev->stats.icmpv6dev)
 296                 goto err_icmp;
 297         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 298                                            GFP_KERNEL);
 299         if (!idev->stats.icmpv6msgdev)
 300                 goto err_icmpmsg;
 301
 302         return 0;
 303
 304 err_icmpmsg:
 305         kfree(idev->stats.icmpv6dev);
 306 err_icmp:
 307         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 308 err_ip:
 309         return -ENOMEM;
 310 }
 311
 312 static void snmp6_free_dev(struct inet6_dev *idev)
 313 {
 314         kfree(idev->stats.icmpv6msgdev);
 315         kfree(idev->stats.icmpv6dev);
 316         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 317 }
 318
 319 /* Nobody refers to this device, we may destroy it. */
 320
 321 void in6_dev_finish_destroy(struct inet6_dev *idev)
 322 {
 323         struct net_device *dev = idev->dev;
 324
 325         WARN_ON(!list_empty(&idev->addr_list));
 326         WARN_ON(idev->mc_list != NULL);
 327
 328 #ifdef NET_REFCNT_DEBUG
 329         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 330 #endif
 331         dev_put(dev);
 332         if (!idev->dead) {
 333                 pr_warning("Freeing alive inet6 device %p\n", idev);
 334                 return;
 335         }
 336         snmp6_free_dev(idev);
 337         kfree_rcu(idev, rcu);
 338 }
 339
 340 EXPORT_SYMBOL(in6_dev_finish_destroy);
 341
 342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 343 {
 344         struct inet6_dev *ndev;
 345
 346         ASSERT_RTNL();
 347
 348         if (dev->mtu < IPV6_MIN_MTU)
 349                 return NULL;
 350
 351         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 352
 353         if (ndev == NULL)
 354                 return NULL;
 355
 356         rwlock_init(&ndev->lock);
 357         ndev->dev = dev;
 358         INIT_LIST_HEAD(&ndev->addr_list);
 359
 360         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 361         ndev->cnf.mtu6 = dev->mtu;
 362         ndev->cnf.sysctl = NULL;
 363         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 364         if (ndev->nd_parms == NULL) {
 365                 kfree(ndev);
 366                 return NULL;
 367         }
 368         if (ndev->cnf.forwarding)
 369                 dev_disable_lro(dev);
 370         /* We refer to the device */
 371         dev_hold(dev);
 372
 373         if (snmp6_alloc_dev(ndev) < 0) {
 374                 ADBG((KERN_WARNING
 375                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 376                         __func__, dev->name));
 377                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 378                 dev_put(dev);
 379                 kfree(ndev);
 380                 return NULL;
 381         }
 382
 383         if (snmp6_register_dev(ndev) < 0) {
 384                 ADBG((KERN_WARNING
 385                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 386                         __func__, dev->name));
 387                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 388                 ndev->dead = 1;
 389                 in6_dev_finish_destroy(ndev);
 390                 return NULL;
 391         }
 392
 393         /* One reference from device.  We must do this before
 394          * we invoke __ipv6_regen_rndid().
 395          */
 396         in6_dev_hold(ndev);
 397
 398         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 399                 ndev->cnf.accept_dad = -1;
 400
 401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 402         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 403                 printk(KERN_INFO
 404                        "%s: Disabled Multicast RS\n",
 405                        dev->name);
 406                 ndev->cnf.rtr_solicits = 0;
 407         }
 408 #endif
 409
 410 #ifdef CONFIG_IPV6_PRIVACY
 411         INIT_LIST_HEAD(&ndev->tempaddr_list);
 412         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 413         if ((dev->flags&IFF_LOOPBACK) ||
 414             dev->type == ARPHRD_TUNNEL ||
 415             dev->type == ARPHRD_TUNNEL6 ||
 416             dev->type == ARPHRD_SIT ||
 417             dev->type == ARPHRD_NONE) {
 418                 ndev->cnf.use_tempaddr = -1;
 419         } else {
 420                 in6_dev_hold(ndev);
 421                 ipv6_regen_rndid((unsigned long) ndev);
 422         }
 423 #endif
 424
 425         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 426                 ndev->if_flags |= IF_READY;
 427
 428         ipv6_mc_init_dev(ndev);
 429         ndev->tstamp = jiffies;
 430         addrconf_sysctl_register(ndev);
 431         /* protected by rtnl_lock */
 432         rcu_assign_pointer(dev->ip6_ptr, ndev);
 433
 434         /* Join all-node multicast group */
 435         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 436
 437         /* Join all-router multicast group if forwarding is set */
 438         if (ndev->cnf.forwarding && dev && (dev->flags & IFF_MULTICAST))
 439                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 440
 441         return ndev;
 442 }
 443
 444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 445 {
 446         struct inet6_dev *idev;
 447
 448         ASSERT_RTNL();
 449
 450         idev = __in6_dev_get(dev);
 451         if (!idev) {
 452                 idev = ipv6_add_dev(dev);
 453                 if (!idev)
 454                         return NULL;
 455         }
 456
 457         if (dev->flags&IFF_UP)
 458                 ipv6_mc_up(idev);
 459         return idev;
 460 }
 461
 462 #ifdef CONFIG_SYSCTL
 463 static void dev_forward_change(struct inet6_dev *idev)
 464 {
 465         struct net_device *dev;
 466         struct inet6_ifaddr *ifa;
 467
 468         if (!idev)
 469                 return;
 470         dev = idev->dev;
 471         if (idev->cnf.forwarding)
 472                 dev_disable_lro(dev);
 473         if (dev && (dev->flags & IFF_MULTICAST)) {
 474                 if (idev->cnf.forwarding)
 475                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 476                 else
 477                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 478         }
 479
 480         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 481                 if (ifa->flags&IFA_F_TENTATIVE)
 482                         continue;
 483                 if (idev->cnf.forwarding)
 484                         addrconf_join_anycast(ifa);
 485                 else
 486                         addrconf_leave_anycast(ifa);
 487         }
 488 }
 489
 490
 491 static void addrconf_forward_change(struct net *net, __s32 newf)
 492 {
 493         struct net_device *dev;
 494         struct inet6_dev *idev;
 495
 496         rcu_read_lock();
 497         for_each_netdev_rcu(net, dev) {
 498                 idev = __in6_dev_get(dev);
 499                 if (idev) {
 500                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 501                         idev->cnf.forwarding = newf;
 502                         if (changed)
 503                                 dev_forward_change(idev);
 504                 }
 505         }
 506         rcu_read_unlock();
 507 }
 508
 509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 510 {
 511         struct net *net;
 512         int old;
 513
 514         if (!rtnl_trylock())
 515                 return restart_syscall();
 516
 517         net = (struct net *)table->extra2;
 518         old = *p;
 519         *p = newf;
 520
 521         if (p == &net->ipv6.devconf_dflt->forwarding) {
 522                 rtnl_unlock();
 523                 return 0;
 524         }
 525
 526         if (p == &net->ipv6.devconf_all->forwarding) {
 527                 net->ipv6.devconf_dflt->forwarding = newf;
 528                 addrconf_forward_change(net, newf);
 529         } else if ((!newf) ^ (!old))
 530                 dev_forward_change((struct inet6_dev *)table->extra1);
 531         rtnl_unlock();
 532
 533         if (newf)
 534                 rt6_purge_dflt_routers(net);
 535         return 1;
 536 }
 537 #endif
 538
 539 /* Nobody refers to this ifaddr, destroy it */
 540 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 541 {
 542         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 543
 544 #ifdef NET_REFCNT_DEBUG
 545         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 546 #endif
 547
 548         in6_dev_put(ifp->idev);
 549
 550         if (del_timer(&ifp->timer))
 551                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 552
 553         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 554                 pr_warning("Freeing alive inet6 address %p\n", ifp);
 555                 return;
 556         }
 557         dst_release(&ifp->rt->dst);
 558
 559         kfree_rcu(ifp, rcu);
 560 }
 561
 562 static void
 563 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 564 {
 565         struct list_head *p;
 566         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 567
 568         /*
 569          * Each device address list is sorted in order of scope -
 570          * global before linklocal.
 571          */
 572         list_for_each(p, &idev->addr_list) {
 573                 struct inet6_ifaddr *ifa
 574                         = list_entry(p, struct inet6_ifaddr, if_list);
 575                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 576                         break;
 577         }
 578
 579         list_add_tail(&ifp->if_list, p);
 580 }
 581
 582 static u32 ipv6_addr_hash(const struct in6_addr *addr)
 583 {
 584         /*
 585          * We perform the hash function over the last 64 bits of the address
 586          * This will include the IEEE address token on links that support it.
 587          */
 588         return jhash_2words((__force u32)addr->s6_addr32[2],
 589                             (__force u32)addr->s6_addr32[3], 0)
 590                 & (IN6_ADDR_HSIZE - 1);
 591 }
 592
 593 /* On success it returns ifp with increased reference count */
 594
 595 static struct inet6_ifaddr *
 596 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 597               int scope, u32 flags)
 598 {
 599         struct inet6_ifaddr *ifa = NULL;
 600         struct rt6_info *rt;
 601         unsigned int hash;
 602         int err = 0;
 603         int addr_type = ipv6_addr_type(addr);
 604
 605         if (addr_type == IPV6_ADDR_ANY ||
 606             addr_type & IPV6_ADDR_MULTICAST ||
 607             (!(idev->dev->flags & IFF_LOOPBACK) &&
 608              addr_type & IPV6_ADDR_LOOPBACK))
 609                 return ERR_PTR(-EADDRNOTAVAIL);
 610
 611         rcu_read_lock_bh();
 612         if (idev->dead) {
 613                 err = -ENODEV;                  /*XXX*/
 614                 goto out2;
 615         }
 616
 617         if (idev->cnf.disable_ipv6) {
 618                 err = -EACCES;
 619                 goto out2;
 620         }
 621
 622         spin_lock(&addrconf_hash_lock);
 623
 624         /* Ignore adding duplicate addresses on an interface */
 625         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 626                 ADBG(("ipv6_add_addr: already assigned\n"));
 627                 err = -EEXIST;
 628                 goto out;
 629         }
 630
 631         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 632
 633         if (ifa == NULL) {
 634                 ADBG(("ipv6_add_addr: malloc failed\n"));
 635                 err = -ENOBUFS;
 636                 goto out;
 637         }
 638
 639         rt = addrconf_dst_alloc(idev, addr, false);
 640         if (IS_ERR(rt)) {
 641                 err = PTR_ERR(rt);
 642                 goto out;
 643         }
 644
 645         ifa->addr = *addr;
 646
 647         spin_lock_init(&ifa->lock);
 648         spin_lock_init(&ifa->state_lock);
 649         init_timer(&ifa->timer);
 650         INIT_HLIST_NODE(&ifa->addr_lst);
 651         ifa->timer.data = (unsigned long) ifa;
 652         ifa->scope = scope;
 653         ifa->prefix_len = pfxlen;
 654         ifa->flags = flags | IFA_F_TENTATIVE;
 655         ifa->cstamp = ifa->tstamp = jiffies;
 656
 657         ifa->rt = rt;
 658
 659         ifa->idev = idev;
 660         in6_dev_hold(idev);
 661         /* For caller */
 662         in6_ifa_hold(ifa);
 663
 664         /* Add to big hash table */
 665         hash = ipv6_addr_hash(addr);
 666
 667         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 668         spin_unlock(&addrconf_hash_lock);
 669
 670         write_lock(&idev->lock);
 671         /* Add to inet6_dev unicast addr list. */
 672         ipv6_link_dev_addr(idev, ifa);
 673
 674 #ifdef CONFIG_IPV6_PRIVACY
 675         if (ifa->flags&IFA_F_TEMPORARY) {
 676                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 677                 in6_ifa_hold(ifa);
 678         }
 679 #endif
 680
 681         in6_ifa_hold(ifa);
 682         write_unlock(&idev->lock);
 683 out2:
 684         rcu_read_unlock_bh();
 685
 686         if (likely(err == 0))
 687                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 688         else {
 689                 kfree(ifa);
 690                 ifa = ERR_PTR(err);
 691         }
 692
 693         return ifa;
 694 out:
 695         spin_unlock(&addrconf_hash_lock);
 696         goto out2;
 697 }
 698
 699 /* This function wants to get referenced ifp and releases it before return */
 700
 701 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 702 {
 703         struct inet6_ifaddr *ifa, *ifn;
 704         struct inet6_dev *idev = ifp->idev;
 705         int state;
 706         int deleted = 0, onlink = 0;
 707         unsigned long expires = jiffies;
 708
 709         spin_lock_bh(&ifp->state_lock);
 710         state = ifp->state;
 711         ifp->state = INET6_IFADDR_STATE_DEAD;
 712         spin_unlock_bh(&ifp->state_lock);
 713
 714         if (state == INET6_IFADDR_STATE_DEAD)
 715                 goto out;
 716
 717         spin_lock_bh(&addrconf_hash_lock);
 718         hlist_del_init_rcu(&ifp->addr_lst);
 719         spin_unlock_bh(&addrconf_hash_lock);
 720
 721         write_lock_bh(&idev->lock);
 722 #ifdef CONFIG_IPV6_PRIVACY
 723         if (ifp->flags&IFA_F_TEMPORARY) {
 724                 list_del(&ifp->tmp_list);
 725                 if (ifp->ifpub) {
 726                         in6_ifa_put(ifp->ifpub);
 727                         ifp->ifpub = NULL;
 728                 }
 729                 __in6_ifa_put(ifp);
 730         }
 731 #endif
 732
 733         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 734                 if (ifa == ifp) {
 735                         list_del_init(&ifp->if_list);
 736                         __in6_ifa_put(ifp);
 737
 738                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 739                                 break;
 740                         deleted = 1;
 741                         continue;
 742                 } else if (ifp->flags & IFA_F_PERMANENT) {
 743                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 744                                               ifp->prefix_len)) {
 745                                 if (ifa->flags & IFA_F_PERMANENT) {
 746                                         onlink = 1;
 747                                         if (deleted)
 748                                                 break;
 749                                 } else {
 750                                         unsigned long lifetime;
 751
 752                                         if (!onlink)
 753                                                 onlink = -1;
 754
 755                                         spin_lock(&ifa->lock);
 756
 757                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 758                                         /*
 759                                          * Note: Because this address is
 760                                          * not permanent, lifetime <
 761                                          * LONG_MAX / HZ here.
 762                                          */
 763                                         if (time_before(expires,
 764                                                         ifa->tstamp + lifetime * HZ))
 765                                                 expires = ifa->tstamp + lifetime * HZ;
 766                                         spin_unlock(&ifa->lock);
 767                                 }
 768                         }
 769                 }
 770         }
 771         write_unlock_bh(&idev->lock);
 772
 773         addrconf_del_timer(ifp);
 774
 775         ipv6_ifa_notify(RTM_DELADDR, ifp);
 776
 777         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 778
 779         /*
 780          * Purge or update corresponding prefix
 781          *
 782          * 1) we don't purge prefix here if address was not permanent.
 783          *    prefix is managed by its own lifetime.
 784          * 2) if there're no addresses, delete prefix.
 785          * 3) if there're still other permanent address(es),
 786          *    corresponding prefix is still permanent.
 787          * 4) otherwise, update prefix lifetime to the
 788          *    longest valid lifetime among the corresponding
 789          *    addresses on the device.
 790          *    Note: subsequent RA will update lifetime.
 791          *
 792          * --yoshfuji
 793          */
 794         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 795                 struct in6_addr prefix;
 796                 struct rt6_info *rt;
 797                 struct net *net = dev_net(ifp->idev->dev);
 798                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 799                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 800
 801                 if (rt && addrconf_is_prefix_route(rt)) {
 802                         if (onlink == 0) {
 803                                 ip6_del_rt(rt);
 804                                 rt = NULL;
 805                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 806                                 rt->dst.expires = expires;
 807                                 rt->rt6i_flags |= RTF_EXPIRES;
 808                         }
 809                 }
 810                 dst_release(&rt->dst);
 811         }
 812
 813         /* clean up prefsrc entries */
 814         rt6_remove_prefsrc(ifp);
 815 out:
 816         in6_ifa_put(ifp);
 817 }
 818
 819 #ifdef CONFIG_IPV6_PRIVACY
 820 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 821 {
 822         struct inet6_dev *idev = ifp->idev;
 823         struct in6_addr addr, *tmpaddr;
 824         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
 825         unsigned long regen_advance;
 826         int tmp_plen;
 827         int ret = 0;
 828         int max_addresses;
 829         u32 addr_flags;
 830         unsigned long now = jiffies;
 831
 832         write_lock(&idev->lock);
 833         if (ift) {
 834                 spin_lock_bh(&ift->lock);
 835                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 836                 spin_unlock_bh(&ift->lock);
 837                 tmpaddr = &addr;
 838         } else {
 839                 tmpaddr = NULL;
 840         }
 841 retry:
 842         in6_dev_hold(idev);
 843         if (idev->cnf.use_tempaddr <= 0) {
 844                 write_unlock(&idev->lock);
 845                 printk(KERN_INFO
 846                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 847                 in6_dev_put(idev);
 848                 ret = -1;
 849                 goto out;
 850         }
 851         spin_lock_bh(&ifp->lock);
 852         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 853                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 854                 spin_unlock_bh(&ifp->lock);
 855                 write_unlock(&idev->lock);
 856                 printk(KERN_WARNING
 857                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 858                 in6_dev_put(idev);
 859                 ret = -1;
 860                 goto out;
 861         }
 862         in6_ifa_hold(ifp);
 863         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 864         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 865                 spin_unlock_bh(&ifp->lock);
 866                 write_unlock(&idev->lock);
 867                 printk(KERN_WARNING
 868                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 869                 in6_ifa_put(ifp);
 870                 in6_dev_put(idev);
 871                 ret = -1;
 872                 goto out;
 873         }
 874         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 875         age = (now - ifp->tstamp) / HZ;
 876         tmp_valid_lft = min_t(__u32,
 877                               ifp->valid_lft,
 878                               idev->cnf.temp_valid_lft + age);
 879         tmp_prefered_lft = min_t(__u32,
 880                                  ifp->prefered_lft,
 881                                  idev->cnf.temp_prefered_lft + age -
 882                                  idev->cnf.max_desync_factor);
 883         tmp_plen = ifp->prefix_len;
 884         max_addresses = idev->cnf.max_addresses;
 885         tmp_tstamp = ifp->tstamp;
 886         spin_unlock_bh(&ifp->lock);
 887
 888         regen_advance = idev->cnf.regen_max_retry *
 889                         idev->cnf.dad_transmits *
 890                         idev->nd_parms->retrans_time / HZ;
 891         write_unlock(&idev->lock);
 892
 893         /* A temporary address is created only if this calculated Preferred
 894          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 895          * an implementation must not create a temporary address with a zero
 896          * Preferred Lifetime.
 897          */
 898         if (tmp_prefered_lft <= regen_advance) {
 899                 in6_ifa_put(ifp);
 900                 in6_dev_put(idev);
 901                 ret = -1;
 902                 goto out;
 903         }
 904
 905         addr_flags = IFA_F_TEMPORARY;
 906         /* set in addrconf_prefix_rcv() */
 907         if (ifp->flags & IFA_F_OPTIMISTIC)
 908                 addr_flags |= IFA_F_OPTIMISTIC;
 909
 910         ift = !max_addresses ||
 911               ipv6_count_addresses(idev) < max_addresses ?
 912                 ipv6_add_addr(idev, &addr, tmp_plen,
 913                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 914                               addr_flags) : NULL;
 915         if (!ift || IS_ERR(ift)) {
 916                 in6_ifa_put(ifp);
 917                 in6_dev_put(idev);
 918                 printk(KERN_INFO
 919                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 920                 tmpaddr = &addr;
 921                 write_lock(&idev->lock);
 922                 goto retry;
 923         }
 924
 925         spin_lock_bh(&ift->lock);
 926         ift->ifpub = ifp;
 927         ift->valid_lft = tmp_valid_lft;
 928         ift->prefered_lft = tmp_prefered_lft;
 929         ift->cstamp = now;
 930         ift->tstamp = tmp_tstamp;
 931         spin_unlock_bh(&ift->lock);
 932
 933         addrconf_dad_start(ift, 0);
 934         in6_ifa_put(ift);
 935         in6_dev_put(idev);
 936 out:
 937         return ret;
 938 }
 939 #endif
 940
 941 /*
 942  *      Choose an appropriate source address (RFC3484)
 943  */
 944 enum {
 945         IPV6_SADDR_RULE_INIT = 0,
 946         IPV6_SADDR_RULE_LOCAL,
 947         IPV6_SADDR_RULE_SCOPE,
 948         IPV6_SADDR_RULE_PREFERRED,
 949 #ifdef CONFIG_IPV6_MIP6
 950         IPV6_SADDR_RULE_HOA,
 951 #endif
 952         IPV6_SADDR_RULE_OIF,
 953         IPV6_SADDR_RULE_LABEL,
 954 #ifdef CONFIG_IPV6_PRIVACY
 955         IPV6_SADDR_RULE_PRIVACY,
 956 #endif
 957         IPV6_SADDR_RULE_ORCHID,
 958         IPV6_SADDR_RULE_PREFIX,
 959         IPV6_SADDR_RULE_MAX
 960 };
 961
 962 struct ipv6_saddr_score {
 963         int                     rule;
 964         int                     addr_type;
 965         struct inet6_ifaddr     *ifa;
 966         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 967         int                     scopedist;
 968         int                     matchlen;
 969 };
 970
 971 struct ipv6_saddr_dst {
 972         const struct in6_addr *addr;
 973         int ifindex;
 974         int scope;
 975         int label;
 976         unsigned int prefs;
 977 };
 978
 979 static inline int ipv6_saddr_preferred(int type)
 980 {
 981         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 982                 return 1;
 983         return 0;
 984 }
 985
 986 static int ipv6_get_saddr_eval(struct net *net,
 987                                struct ipv6_saddr_score *score,
 988                                struct ipv6_saddr_dst *dst,
 989                                int i)
 990 {
 991         int ret;
 992
 993         if (i <= score->rule) {
 994                 switch (i) {
 995                 case IPV6_SADDR_RULE_SCOPE:
 996                         ret = score->scopedist;
 997                         break;
 998                 case IPV6_SADDR_RULE_PREFIX:
 999                         ret = score->matchlen;
1000                         break;
1001                 default:
1002                         ret = !!test_bit(i, score->scorebits);
1003                 }
1004                 goto out;
1005         }
1006
1007         switch (i) {
1008         case IPV6_SADDR_RULE_INIT:
1009                 /* Rule 0: remember if hiscore is not ready yet */
1010                 ret = !!score->ifa;
1011                 break;
1012         case IPV6_SADDR_RULE_LOCAL:
1013                 /* Rule 1: Prefer same address */
1014                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1015                 break;
1016         case IPV6_SADDR_RULE_SCOPE:
1017                 /* Rule 2: Prefer appropriate scope
1018                  *
1019                  *      ret
1020                  *       ^
1021                  *    -1 |  d 15
1022                  *    ---+--+-+---> scope
1023                  *       |
1024                  *       |             d is scope of the destination.
1025                  *  B-d  |  \
1026                  *       |   \      <- smaller scope is better if
1027                  *  B-15 |    \        if scope is enough for destinaion.
1028                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1029                  * d-C-1 | /
1030                  *       |/         <- greater is better
1031                  *   -C  /             if scope is not enough for destination.
1032                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1033                  *
1034                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1035                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1036                  * Assume B = 0 and we get C > 29.
1037                  */
1038                 ret = __ipv6_addr_src_scope(score->addr_type);
1039                 if (ret >= dst->scope)
1040                         ret = -ret;
1041                 else
1042                         ret -= 128;     /* 30 is enough */
1043                 score->scopedist = ret;
1044                 break;
1045         case IPV6_SADDR_RULE_PREFERRED:
1046                 /* Rule 3: Avoid deprecated and optimistic addresses */
1047                 ret = ipv6_saddr_preferred(score->addr_type) ||
1048                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1049                 break;
1050 #ifdef CONFIG_IPV6_MIP6
1051         case IPV6_SADDR_RULE_HOA:
1052             {
1053                 /* Rule 4: Prefer home address */
1054                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1055                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1056                 break;
1057             }
1058 #endif
1059         case IPV6_SADDR_RULE_OIF:
1060                 /* Rule 5: Prefer outgoing interface */
1061                 ret = (!dst->ifindex ||
1062                        dst->ifindex == score->ifa->idev->dev->ifindex);
1063                 break;
1064         case IPV6_SADDR_RULE_LABEL:
1065                 /* Rule 6: Prefer matching label */
1066                 ret = ipv6_addr_label(net,
1067                                       &score->ifa->addr, score->addr_type,
1068                                       score->ifa->idev->dev->ifindex) == dst->label;
1069                 break;
1070 #ifdef CONFIG_IPV6_PRIVACY
1071         case IPV6_SADDR_RULE_PRIVACY:
1072             {
1073                 /* Rule 7: Prefer public address
1074                  * Note: prefer temporary address if use_tempaddr >= 2
1075                  */
1076                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1077                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1078                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1079                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1080                 break;
1081             }
1082 #endif
1083         case IPV6_SADDR_RULE_ORCHID:
1084                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1085                  *          non-ORCHID vs non-ORCHID
1086                  */
1087                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1088                         ipv6_addr_orchid(dst->addr));
1089                 break;
1090         case IPV6_SADDR_RULE_PREFIX:
1091                 /* Rule 8: Use longest matching prefix */
1092                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1093                                                        dst->addr);
1094                 break;
1095         default:
1096                 ret = 0;
1097         }
1098
1099         if (ret)
1100                 __set_bit(i, score->scorebits);
1101         score->rule = i;
1102 out:
1103         return ret;
1104 }
1105
1106 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1107                        const struct in6_addr *daddr, unsigned int prefs,
1108                        struct in6_addr *saddr)
1109 {
1110         struct ipv6_saddr_score scores[2],
1111                                 *score = &scores[0], *hiscore = &scores[1];
1112         struct ipv6_saddr_dst dst;
1113         struct net_device *dev;
1114         int dst_type;
1115
1116         dst_type = __ipv6_addr_type(daddr);
1117         dst.addr = daddr;
1118         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1119         dst.scope = __ipv6_addr_src_scope(dst_type);
1120         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1121         dst.prefs = prefs;
1122
1123         hiscore->rule = -1;
1124         hiscore->ifa = NULL;
1125
1126         rcu_read_lock();
1127
1128         for_each_netdev_rcu(net, dev) {
1129                 struct inet6_dev *idev;
1130
1131                 /* Candidate Source Address (section 4)
1132                  *  - multicast and link-local destination address,
1133                  *    the set of candidate source address MUST only
1134                  *    include addresses assigned to interfaces
1135                  *    belonging to the same link as the outgoing
1136                  *    interface.
1137                  * (- For site-local destination addresses, the
1138                  *    set of candidate source addresses MUST only
1139                  *    include addresses assigned to interfaces
1140                  *    belonging to the same site as the outgoing
1141                  *    interface.)
1142                  */
1143                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1144                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1145                     dst.ifindex && dev->ifindex != dst.ifindex)
1146                         continue;
1147
1148                 idev = __in6_dev_get(dev);
1149                 if (!idev)
1150                         continue;
1151
1152                 read_lock_bh(&idev->lock);
1153                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1154                         int i;
1155
1156                         /*
1157                          * - Tentative Address (RFC2462 section 5.4)
1158                          *  - A tentative address is not considered
1159                          *    "assigned to an interface" in the traditional
1160                          *    sense, unless it is also flagged as optimistic.
1161                          * - Candidate Source Address (section 4)
1162                          *  - In any case, anycast addresses, multicast
1163                          *    addresses, and the unspecified address MUST
1164                          *    NOT be included in a candidate set.
1165                          */
1166                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1167                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1168                                 continue;
1169
1170                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1171
1172                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1173                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1174                                 LIMIT_NETDEBUG(KERN_DEBUG
1175                                                "ADDRCONF: unspecified / multicast address "
1176                                                "assigned as unicast address on %s",
1177                                                dev->name);
1178                                 continue;
1179                         }
1180
1181                         score->rule = -1;
1182                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1183
1184                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1185                                 int minihiscore, miniscore;
1186
1187                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1188                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1189
1190                                 if (minihiscore > miniscore) {
1191                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1192                                             score->scopedist > 0) {
1193                                                 /*
1194                                                  * special case:
1195                                                  * each remaining entry
1196                                                  * has too small (not enough)
1197                                                  * scope, because ifa entries
1198                                                  * are sorted by their scope
1199                                                  * values.
1200                                                  */
1201                                                 goto try_nextdev;
1202                                         }
1203                                         break;
1204                                 } else if (minihiscore < miniscore) {
1205                                         if (hiscore->ifa)
1206                                                 in6_ifa_put(hiscore->ifa);
1207
1208                                         in6_ifa_hold(score->ifa);
1209
1210                                         swap(hiscore, score);
1211
1212                                         /* restore our iterator */
1213                                         score->ifa = hiscore->ifa;
1214
1215                                         break;
1216                                 }
1217                         }
1218                 }
1219 try_nextdev:
1220                 read_unlock_bh(&idev->lock);
1221         }
1222         rcu_read_unlock();
1223
1224         if (!hiscore->ifa)
1225                 return -EADDRNOTAVAIL;
1226
1227         *saddr = hiscore->ifa->addr;
1228         in6_ifa_put(hiscore->ifa);
1229         return 0;
1230 }
1231 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1232
1233 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1234                     unsigned char banned_flags)
1235 {
1236         struct inet6_dev *idev;
1237         int err = -EADDRNOTAVAIL;
1238
1239         rcu_read_lock();
1240         idev = __in6_dev_get(dev);
1241         if (idev) {
1242                 struct inet6_ifaddr *ifp;
1243
1244                 read_lock_bh(&idev->lock);
1245                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1246                         if (ifp->scope == IFA_LINK &&
1247                             !(ifp->flags & banned_flags)) {
1248                                 *addr = ifp->addr;
1249                                 err = 0;
1250                                 break;
1251                         }
1252                 }
1253                 read_unlock_bh(&idev->lock);
1254         }
1255         rcu_read_unlock();
1256         return err;
1257 }
1258
1259 static int ipv6_count_addresses(struct inet6_dev *idev)
1260 {
1261         int cnt = 0;
1262         struct inet6_ifaddr *ifp;
1263
1264         read_lock_bh(&idev->lock);
1265         list_for_each_entry(ifp, &idev->addr_list, if_list)
1266                 cnt++;
1267         read_unlock_bh(&idev->lock);
1268         return cnt;
1269 }
1270
1271 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1272                   struct net_device *dev, int strict)
1273 {
1274         struct inet6_ifaddr *ifp;
1275         struct hlist_node *node;
1276         unsigned int hash = ipv6_addr_hash(addr);
1277
1278         rcu_read_lock_bh();
1279         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1280                 if (!net_eq(dev_net(ifp->idev->dev), net))
1281                         continue;
1282                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1283                     !(ifp->flags&IFA_F_TENTATIVE) &&
1284                     (dev == NULL || ifp->idev->dev == dev ||
1285                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1286                         rcu_read_unlock_bh();
1287                         return 1;
1288                 }
1289         }
1290
1291         rcu_read_unlock_bh();
1292         return 0;
1293 }
1294 EXPORT_SYMBOL(ipv6_chk_addr);
1295
1296 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1297                                struct net_device *dev)
1298 {
1299         unsigned int hash = ipv6_addr_hash(addr);
1300         struct inet6_ifaddr *ifp;
1301         struct hlist_node *node;
1302
1303         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1304                 if (!net_eq(dev_net(ifp->idev->dev), net))
1305                         continue;
1306                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1307                         if (dev == NULL || ifp->idev->dev == dev)
1308                                 return true;
1309                 }
1310         }
1311         return false;
1312 }
1313
1314 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1315 {
1316         struct inet6_dev *idev;
1317         struct inet6_ifaddr *ifa;
1318         int     onlink;
1319
1320         onlink = 0;
1321         rcu_read_lock();
1322         idev = __in6_dev_get(dev);
1323         if (idev) {
1324                 read_lock_bh(&idev->lock);
1325                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1326                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1327                                                    ifa->prefix_len);
1328                         if (onlink)
1329                                 break;
1330                 }
1331                 read_unlock_bh(&idev->lock);
1332         }
1333         rcu_read_unlock();
1334         return onlink;
1335 }
1336
1337 EXPORT_SYMBOL(ipv6_chk_prefix);
1338
1339 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1340                                      struct net_device *dev, int strict)
1341 {
1342         struct inet6_ifaddr *ifp, *result = NULL;
1343         unsigned int hash = ipv6_addr_hash(addr);
1344         struct hlist_node *node;
1345
1346         rcu_read_lock_bh();
1347         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1348                 if (!net_eq(dev_net(ifp->idev->dev), net))
1349                         continue;
1350                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1351                         if (dev == NULL || ifp->idev->dev == dev ||
1352                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1353                                 result = ifp;
1354                                 in6_ifa_hold(ifp);
1355                                 break;
1356                         }
1357                 }
1358         }
1359         rcu_read_unlock_bh();
1360
1361         return result;
1362 }
1363
1364 /* Gets referenced address, destroys ifaddr */
1365
1366 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1367 {
1368         if (ifp->flags&IFA_F_PERMANENT) {
1369                 spin_lock_bh(&ifp->lock);
1370                 addrconf_del_timer(ifp);
1371                 ifp->flags |= IFA_F_TENTATIVE;
1372                 if (dad_failed)
1373                         ifp->flags |= IFA_F_DADFAILED;
1374                 spin_unlock_bh(&ifp->lock);
1375                 if (dad_failed)
1376                         ipv6_ifa_notify(0, ifp);
1377                 in6_ifa_put(ifp);
1378 #ifdef CONFIG_IPV6_PRIVACY
1379         } else if (ifp->flags&IFA_F_TEMPORARY) {
1380                 struct inet6_ifaddr *ifpub;
1381                 spin_lock_bh(&ifp->lock);
1382                 ifpub = ifp->ifpub;
1383                 if (ifpub) {
1384                         in6_ifa_hold(ifpub);
1385                         spin_unlock_bh(&ifp->lock);
1386                         ipv6_create_tempaddr(ifpub, ifp);
1387                         in6_ifa_put(ifpub);
1388                 } else {
1389                         spin_unlock_bh(&ifp->lock);
1390                 }
1391                 ipv6_del_addr(ifp);
1392 #endif
1393         } else
1394                 ipv6_del_addr(ifp);
1395 }
1396
1397 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1398 {
1399         int err = -ENOENT;
1400
1401         spin_lock(&ifp->state_lock);
1402         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1403                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1404                 err = 0;
1405         }
1406         spin_unlock(&ifp->state_lock);
1407
1408         return err;
1409 }
1410
1411 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1412 {
1413         struct inet6_dev *idev = ifp->idev;
1414
1415         if (addrconf_dad_end(ifp)) {
1416                 in6_ifa_put(ifp);
1417                 return;
1418         }
1419
1420         if (net_ratelimit())
1421                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1422                         ifp->idev->dev->name, &ifp->addr);
1423
1424         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1425                 struct in6_addr addr;
1426
1427                 addr.s6_addr32[0] = htonl(0xfe800000);
1428                 addr.s6_addr32[1] = 0;
1429
1430                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1431                     ipv6_addr_equal(&ifp->addr, &addr)) {
1432                         /* DAD failed for link-local based on MAC address */
1433                         idev->cnf.disable_ipv6 = 1;
1434
1435                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1436                                 ifp->idev->dev->name);
1437                 }
1438         }
1439
1440         addrconf_dad_stop(ifp, 1);
1441 }
1442
1443 /* Join to solicited addr multicast group. */
1444
1445 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1446 {
1447         struct in6_addr maddr;
1448
1449         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1450                 return;
1451
1452         addrconf_addr_solict_mult(addr, &maddr);
1453         ipv6_dev_mc_inc(dev, &maddr);
1454 }
1455
1456 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1457 {
1458         struct in6_addr maddr;
1459
1460         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1461                 return;
1462
1463         addrconf_addr_solict_mult(addr, &maddr);
1464         __ipv6_dev_mc_dec(idev, &maddr);
1465 }
1466
1467 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1468 {
1469         struct in6_addr addr;
1470         if (ifp->prefix_len == 127) /* RFC 6164 */
1471                 return;
1472         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1473         if (ipv6_addr_any(&addr))
1474                 return;
1475         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1476 }
1477
1478 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1479 {
1480         struct in6_addr addr;
1481         if (ifp->prefix_len == 127) /* RFC 6164 */
1482                 return;
1483         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1484         if (ipv6_addr_any(&addr))
1485                 return;
1486         __ipv6_dev_ac_dec(ifp->idev, &addr);
1487 }
1488
1489 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1490 {
1491         if (dev->addr_len != ETH_ALEN)
1492                 return -1;
1493         memcpy(eui, dev->dev_addr, 3);
1494         memcpy(eui + 5, dev->dev_addr + 3, 3);
1495
1496         /*
1497          * The zSeries OSA network cards can be shared among various
1498          * OS instances, but the OSA cards have only one MAC address.
1499          * This leads to duplicate address conflicts in conjunction
1500          * with IPv6 if more than one instance uses the same card.
1501          *
1502          * The driver for these cards can deliver a unique 16-bit
1503          * identifier for each instance sharing the same card.  It is
1504          * placed instead of 0xFFFE in the interface identifier.  The
1505          * "u" bit of the interface identifier is not inverted in this
1506          * case.  Hence the resulting interface identifier has local
1507          * scope according to RFC2373.
1508          */
1509         if (dev->dev_id) {
1510                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1511                 eui[4] = dev->dev_id & 0xFF;
1512         } else {
1513                 eui[3] = 0xFF;
1514                 eui[4] = 0xFE;
1515                 eui[0] ^= 2;
1516         }
1517         return 0;
1518 }
1519
1520 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1521 {
1522         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1523         if (dev->addr_len != ARCNET_ALEN)
1524                 return -1;
1525         memset(eui, 0, 7);
1526         eui[7] = *(u8*)dev->dev_addr;
1527         return 0;
1528 }
1529
1530 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1531 {
1532         if (dev->addr_len != INFINIBAND_ALEN)
1533                 return -1;
1534         memcpy(eui, dev->dev_addr + 12, 8);
1535         eui[0] |= 2;
1536         return 0;
1537 }
1538
1539 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1540 {
1541         if (addr == 0)
1542                 return -1;
1543         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1544                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1545                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1546                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1547                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1548                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1549         eui[1] = 0;
1550         eui[2] = 0x5E;
1551         eui[3] = 0xFE;
1552         memcpy(eui + 4, &addr, 4);
1553         return 0;
1554 }
1555
1556 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1557 {
1558         if (dev->priv_flags & IFF_ISATAP)
1559                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1560         return -1;
1561 }
1562
1563 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1564 {
1565         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1566 }
1567
1568 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1569 {
1570         switch (dev->type) {
1571         case ARPHRD_ETHER:
1572         case ARPHRD_FDDI:
1573         case ARPHRD_IEEE802_TR:
1574                 return addrconf_ifid_eui48(eui, dev);
1575         case ARPHRD_ARCNET:
1576                 return addrconf_ifid_arcnet(eui, dev);
1577         case ARPHRD_INFINIBAND:
1578                 return addrconf_ifid_infiniband(eui, dev);
1579         case ARPHRD_SIT:
1580                 return addrconf_ifid_sit(eui, dev);
1581         case ARPHRD_IPGRE:
1582                 return addrconf_ifid_gre(eui, dev);
1583         }
1584         return -1;
1585 }
1586
1587 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1588 {
1589         int err = -1;
1590         struct inet6_ifaddr *ifp;
1591
1592         read_lock_bh(&idev->lock);
1593         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1594                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1595                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1596                         err = 0;
1597                         break;
1598                 }
1599         }
1600         read_unlock_bh(&idev->lock);
1601         return err;
1602 }
1603
1604 #ifdef CONFIG_IPV6_PRIVACY
1605 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1606 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1607 {
1608 regen:
1609         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1610         idev->rndid[0] &= ~0x02;
1611
1612         /*
1613          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1614          * check if generated address is not inappropriate
1615          *
1616          *  - Reserved subnet anycast (RFC 2526)
1617          *      11111101 11....11 1xxxxxxx
1618          *  - ISATAP (RFC4214) 6.1
1619          *      00-00-5E-FE-xx-xx-xx-xx
1620          *  - value 0
1621          *  - XXX: already assigned to an address on the device
1622          */
1623         if (idev->rndid[0] == 0xfd &&
1624             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1625             (idev->rndid[7]&0x80))
1626                 goto regen;
1627         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1628                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1629                         goto regen;
1630                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1631                         goto regen;
1632         }
1633
1634         return 0;
1635 }
1636
1637 static void ipv6_regen_rndid(unsigned long data)
1638 {
1639         struct inet6_dev *idev = (struct inet6_dev *) data;
1640         unsigned long expires;
1641
1642         rcu_read_lock_bh();
1643         write_lock_bh(&idev->lock);
1644
1645         if (idev->dead)
1646                 goto out;
1647
1648         if (__ipv6_regen_rndid(idev) < 0)
1649                 goto out;
1650
1651         expires = jiffies +
1652                 idev->cnf.temp_prefered_lft * HZ -
1653                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1654                 idev->cnf.max_desync_factor * HZ;
1655         if (time_before(expires, jiffies)) {
1656                 printk(KERN_WARNING
1657                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1658                         idev->dev->name);
1659                 goto out;
1660         }
1661
1662         if (!mod_timer(&idev->regen_timer, expires))
1663                 in6_dev_hold(idev);
1664
1665 out:
1666         write_unlock_bh(&idev->lock);
1667         rcu_read_unlock_bh();
1668         in6_dev_put(idev);
1669 }
1670
1671 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1672         int ret = 0;
1673
1674         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1675                 ret = __ipv6_regen_rndid(idev);
1676         return ret;
1677 }
1678 #endif
1679
1680 /*
1681  *      Add prefix route.
1682  */
1683
1684 static void
1685 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1686                       unsigned long expires, u32 flags)
1687 {
1688         struct fib6_config cfg = {
1689                 .fc_table = RT6_TABLE_PREFIX,
1690                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1691                 .fc_ifindex = dev->ifindex,
1692                 .fc_expires = expires,
1693                 .fc_dst_len = plen,
1694                 .fc_flags = RTF_UP | flags,
1695                 .fc_nlinfo.nl_net = dev_net(dev),
1696                 .fc_protocol = RTPROT_KERNEL,
1697         };
1698
1699         cfg.fc_dst = *pfx;
1700
1701         /* Prevent useless cloning on PtP SIT.
1702            This thing is done here expecting that the whole
1703            class of non-broadcast devices need not cloning.
1704          */
1705 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1706         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1707                 cfg.fc_flags |= RTF_NONEXTHOP;
1708 #endif
1709
1710         ip6_route_add(&cfg);
1711 }
1712
1713
1714 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1715                                                   int plen,
1716                                                   const struct net_device *dev,
1717                                                   u32 flags, u32 noflags)
1718 {
1719         struct fib6_node *fn;
1720         struct rt6_info *rt = NULL;
1721         struct fib6_table *table;
1722
1723         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1724         if (table == NULL)
1725                 return NULL;
1726
1727         write_lock_bh(&table->tb6_lock);
1728         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1729         if (!fn)
1730                 goto out;
1731         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1732                 if (rt->dst.dev->ifindex != dev->ifindex)
1733                         continue;
1734                 if ((rt->rt6i_flags & flags) != flags)
1735                         continue;
1736                 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1737                         continue;
1738                 dst_hold(&rt->dst);
1739                 break;
1740         }
1741 out:
1742         write_unlock_bh(&table->tb6_lock);
1743         return rt;
1744 }
1745
1746
1747 /* Create "default" multicast route to the interface */
1748
1749 static void addrconf_add_mroute(struct net_device *dev)
1750 {
1751         struct fib6_config cfg = {
1752                 .fc_table = RT6_TABLE_LOCAL,
1753                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1754                 .fc_ifindex = dev->ifindex,
1755                 .fc_dst_len = 8,
1756                 .fc_flags = RTF_UP,
1757                 .fc_nlinfo.nl_net = dev_net(dev),
1758         };
1759
1760         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1761
1762         ip6_route_add(&cfg);
1763 }
1764
1765 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1766 static void sit_route_add(struct net_device *dev)
1767 {
1768         struct fib6_config cfg = {
1769                 .fc_table = RT6_TABLE_MAIN,
1770                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1771                 .fc_ifindex = dev->ifindex,
1772                 .fc_dst_len = 96,
1773                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1774                 .fc_nlinfo.nl_net = dev_net(dev),
1775         };
1776
1777         /* prefix length - 96 bits "::d.d.d.d" */
1778         ip6_route_add(&cfg);
1779 }
1780 #endif
1781
1782 static void addrconf_add_lroute(struct net_device *dev)
1783 {
1784         struct in6_addr addr;
1785
1786         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1787         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1788 }
1789
1790 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1791 {
1792         struct inet6_dev *idev;
1793
1794         ASSERT_RTNL();
1795
1796         idev = ipv6_find_idev(dev);
1797         if (!idev)
1798                 return ERR_PTR(-ENOBUFS);
1799
1800         if (idev->cnf.disable_ipv6)
1801                 return ERR_PTR(-EACCES);
1802
1803         /* Add default multicast route */
1804         if (!(dev->flags & IFF_LOOPBACK))
1805                 addrconf_add_mroute(dev);
1806
1807         /* Add link local route */
1808         addrconf_add_lroute(dev);
1809         return idev;
1810 }
1811
1812 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1813 {
1814         struct prefix_info *pinfo;
1815         __u32 valid_lft;
1816         __u32 prefered_lft;
1817         int addr_type;
1818         struct inet6_dev *in6_dev;
1819         struct net *net = dev_net(dev);
1820
1821         pinfo = (struct prefix_info *) opt;
1822
1823         if (len < sizeof(struct prefix_info)) {
1824                 ADBG(("addrconf: prefix option too short\n"));
1825                 return;
1826         }
1827
1828         /*
1829          *      Validation checks ([ADDRCONF], page 19)
1830          */
1831
1832         addr_type = ipv6_addr_type(&pinfo->prefix);
1833
1834         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1835                 return;
1836
1837         valid_lft = ntohl(pinfo->valid);
1838         prefered_lft = ntohl(pinfo->prefered);
1839
1840         if (prefered_lft > valid_lft) {
1841                 if (net_ratelimit())
1842                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1843                 return;
1844         }
1845
1846         in6_dev = in6_dev_get(dev);
1847
1848         if (in6_dev == NULL) {
1849                 if (net_ratelimit())
1850                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1851                 return;
1852         }
1853
1854         /*
1855          *      Two things going on here:
1856          *      1) Add routes for on-link prefixes
1857          *      2) Configure prefixes with the auto flag set
1858          */
1859
1860         if (pinfo->onlink) {
1861                 struct rt6_info *rt;
1862                 unsigned long rt_expires;
1863
1864                 /* Avoid arithmetic overflow. Really, we could
1865                  * save rt_expires in seconds, likely valid_lft,
1866                  * but it would require division in fib gc, that it
1867                  * not good.
1868                  */
1869                 if (HZ > USER_HZ)
1870                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1871                 else
1872                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1873
1874                 if (addrconf_finite_timeout(rt_expires))
1875                         rt_expires *= HZ;
1876
1877                 rt = addrconf_get_prefix_route(&pinfo->prefix,
1878                                                pinfo->prefix_len,
1879                                                dev,
1880                                                RTF_ADDRCONF | RTF_PREFIX_RT,
1881                                                RTF_GATEWAY | RTF_DEFAULT);
1882
1883                 if (rt) {
1884                         /* Autoconf prefix route */
1885                         if (valid_lft == 0) {
1886                                 ip6_del_rt(rt);
1887                                 rt = NULL;
1888                         } else if (addrconf_finite_timeout(rt_expires)) {
1889                                 /* not infinity */
1890                                 rt->dst.expires = jiffies + rt_expires;
1891                                 rt->rt6i_flags |= RTF_EXPIRES;
1892                         } else {
1893                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1894                                 rt->dst.expires = 0;
1895                         }
1896                 } else if (valid_lft) {
1897                         clock_t expires = 0;
1898                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1899                         if (addrconf_finite_timeout(rt_expires)) {
1900                                 /* not infinity */
1901                                 flags |= RTF_EXPIRES;
1902                                 expires = jiffies_to_clock_t(rt_expires);
1903                         }
1904                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1905                                               dev, expires, flags);
1906                 }
1907                 if (rt)
1908                         dst_release(&rt->dst);
1909         }
1910
1911         /* Try to figure out our local address for this prefix */
1912
1913         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1914                 struct inet6_ifaddr * ifp;
1915                 struct in6_addr addr;
1916                 int create = 0, update_lft = 0;
1917
1918                 if (pinfo->prefix_len == 64) {
1919                         memcpy(&addr, &pinfo->prefix, 8);
1920                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1921                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1922                                 in6_dev_put(in6_dev);
1923                                 return;
1924                         }
1925                         goto ok;
1926                 }
1927                 if (net_ratelimit())
1928                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1929                                pinfo->prefix_len);
1930                 in6_dev_put(in6_dev);
1931                 return;
1932
1933 ok:
1934
1935                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1936
1937                 if (ifp == NULL && valid_lft) {
1938                         int max_addresses = in6_dev->cnf.max_addresses;
1939                         u32 addr_flags = 0;
1940
1941 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1942                         if (in6_dev->cnf.optimistic_dad &&
1943                             !net->ipv6.devconf_all->forwarding && sllao)
1944                                 addr_flags = IFA_F_OPTIMISTIC;
1945 #endif
1946
1947                         /* Do not allow to create too much of autoconfigured
1948                          * addresses; this would be too easy way to crash kernel.
1949                          */
1950                         if (!max_addresses ||
1951                             ipv6_count_addresses(in6_dev) < max_addresses)
1952                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1953                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1954                                                     addr_flags);
1955
1956                         if (!ifp || IS_ERR(ifp)) {
1957                                 in6_dev_put(in6_dev);
1958                                 return;
1959                         }
1960
1961                         update_lft = create = 1;
1962                         ifp->cstamp = jiffies;
1963                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1964                 }
1965
1966                 if (ifp) {
1967                         int flags;
1968                         unsigned long now;
1969 #ifdef CONFIG_IPV6_PRIVACY
1970                         struct inet6_ifaddr *ift;
1971 #endif
1972                         u32 stored_lft;
1973
1974                         /* update lifetime (RFC2462 5.5.3 e) */
1975                         spin_lock(&ifp->lock);
1976                         now = jiffies;
1977                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1978                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1979                         else
1980                                 stored_lft = 0;
1981                         if (!update_lft && stored_lft) {
1982                                 if (valid_lft > MIN_VALID_LIFETIME ||
1983                                     valid_lft > stored_lft)
1984                                         update_lft = 1;
1985                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1986                                         /* valid_lft <= stored_lft is always true */
1987                                         /*
1988                                          * RFC 4862 Section 5.5.3e:
1989                                          * "Note that the preferred lifetime of
1990                                          *  the corresponding address is always
1991                                          *  reset to the Preferred Lifetime in
1992                                          *  the received Prefix Information
1993                                          *  option, regardless of whether the
1994                                          *  valid lifetime is also reset or
1995                                          *  ignored."
1996                                          *
1997                                          *  So if the preferred lifetime in
1998                                          *  this advertisement is different
1999                                          *  than what we have stored, but the
2000                                          *  valid lifetime is invalid, just
2001                                          *  reset prefered_lft.
2002                                          *
2003                                          *  We must set the valid lifetime
2004                                          *  to the stored lifetime since we'll
2005                                          *  be updating the timestamp below,
2006                                          *  else we'll set it back to the
2007                                          *  minimum.
2008                                          */
2009                                         if (prefered_lft != ifp->prefered_lft) {
2010                                                 valid_lft = stored_lft;
2011                                                 update_lft = 1;
2012                                         }
2013                                 } else {
2014                                         valid_lft = MIN_VALID_LIFETIME;
2015                                         if (valid_lft < prefered_lft)
2016                                                 prefered_lft = valid_lft;
2017                                         update_lft = 1;
2018                                 }
2019                         }
2020
2021                         if (update_lft) {
2022                                 ifp->valid_lft = valid_lft;
2023                                 ifp->prefered_lft = prefered_lft;
2024                                 ifp->tstamp = now;
2025                                 flags = ifp->flags;
2026                                 ifp->flags &= ~IFA_F_DEPRECATED;
2027                                 spin_unlock(&ifp->lock);
2028
2029                                 if (!(flags&IFA_F_TENTATIVE))
2030                                         ipv6_ifa_notify(0, ifp);
2031                         } else
2032                                 spin_unlock(&ifp->lock);
2033
2034 #ifdef CONFIG_IPV6_PRIVACY
2035                         read_lock_bh(&in6_dev->lock);
2036                         /* update all temporary addresses in the list */
2037                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2038                                             tmp_list) {
2039                                 int age, max_valid, max_prefered;
2040
2041                                 if (ifp != ift->ifpub)
2042                                         continue;
2043
2044                                 /*
2045                                  * RFC 4941 section 3.3:
2046                                  * If a received option will extend the lifetime
2047                                  * of a public address, the lifetimes of
2048                                  * temporary addresses should be extended,
2049                                  * subject to the overall constraint that no
2050                                  * temporary addresses should ever remain
2051                                  * "valid" or "preferred" for a time longer than
2052                                  * (TEMP_VALID_LIFETIME) or
2053                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2054                                  * respectively.
2055                                  */
2056                                 age = (now - ift->cstamp) / HZ;
2057                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2058                                 if (max_valid < 0)
2059                                         max_valid = 0;
2060
2061                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2062                                                in6_dev->cnf.max_desync_factor -
2063                                                age;
2064                                 if (max_prefered < 0)
2065                                         max_prefered = 0;
2066
2067                                 if (valid_lft > max_valid)
2068                                         valid_lft = max_valid;
2069
2070                                 if (prefered_lft > max_prefered)
2071                                         prefered_lft = max_prefered;
2072
2073                                 spin_lock(&ift->lock);
2074                                 flags = ift->flags;
2075                                 ift->valid_lft = valid_lft;
2076                                 ift->prefered_lft = prefered_lft;
2077                                 ift->tstamp = now;
2078                                 if (prefered_lft > 0)
2079                                         ift->flags &= ~IFA_F_DEPRECATED;
2080
2081                                 spin_unlock(&ift->lock);
2082                                 if (!(flags&IFA_F_TENTATIVE))
2083                                         ipv6_ifa_notify(0, ift);
2084                         }
2085
2086                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2087                                 /*
2088                                  * When a new public address is created as
2089                                  * described in [ADDRCONF], also create a new
2090                                  * temporary address. Also create a temporary
2091                                  * address if it's enabled but no temporary
2092                                  * address currently exists.
2093                                  */
2094                                 read_unlock_bh(&in6_dev->lock);
2095                                 ipv6_create_tempaddr(ifp, NULL);
2096                         } else {
2097                                 read_unlock_bh(&in6_dev->lock);
2098                         }
2099 #endif
2100                         in6_ifa_put(ifp);
2101                         addrconf_verify(0);
2102                 }
2103         }
2104         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2105         in6_dev_put(in6_dev);
2106 }
2107
2108 /*
2109  *      Set destination address.
2110  *      Special case for SIT interfaces where we create a new "virtual"
2111  *      device.
2112  */
2113 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2114 {
2115         struct in6_ifreq ireq;
2116         struct net_device *dev;
2117         int err = -EINVAL;
2118
2119         rtnl_lock();
2120
2121         err = -EFAULT;
2122         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2123                 goto err_exit;
2124
2125         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2126
2127         err = -ENODEV;
2128         if (dev == NULL)
2129                 goto err_exit;
2130
2131 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2132         if (dev->type == ARPHRD_SIT) {
2133                 const struct net_device_ops *ops = dev->netdev_ops;
2134                 struct ifreq ifr;
2135                 struct ip_tunnel_parm p;
2136
2137                 err = -EADDRNOTAVAIL;
2138                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2139                         goto err_exit;
2140
2141                 memset(&p, 0, sizeof(p));
2142                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2143                 p.iph.saddr = 0;
2144                 p.iph.version = 4;
2145                 p.iph.ihl = 5;
2146                 p.iph.protocol = IPPROTO_IPV6;
2147                 p.iph.ttl = 64;
2148                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2149
2150                 if (ops->ndo_do_ioctl) {
2151                         mm_segment_t oldfs = get_fs();
2152
2153                         set_fs(KERNEL_DS);
2154                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2155                         set_fs(oldfs);
2156                 } else
2157                         err = -EOPNOTSUPP;
2158
2159                 if (err == 0) {
2160                         err = -ENOBUFS;
2161                         dev = __dev_get_by_name(net, p.name);
2162                         if (!dev)
2163                                 goto err_exit;
2164                         err = dev_open(dev);
2165                 }
2166         }
2167 #endif
2168
2169 err_exit:
2170         rtnl_unlock();
2171         return err;
2172 }
2173
2174 /*
2175  *      Manual configuration of address on an interface
2176  */
2177 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2178                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2179                           __u32 valid_lft)
2180 {
2181         struct inet6_ifaddr *ifp;
2182         struct inet6_dev *idev;
2183         struct net_device *dev;
2184         int scope;
2185         u32 flags;
2186         clock_t expires;
2187         unsigned long timeout;
2188
2189         ASSERT_RTNL();
2190
2191         if (plen > 128)
2192                 return -EINVAL;
2193
2194         /* check the lifetime */
2195         if (!valid_lft || prefered_lft > valid_lft)
2196                 return -EINVAL;
2197
2198         dev = __dev_get_by_index(net, ifindex);
2199         if (!dev)
2200                 return -ENODEV;
2201
2202         idev = addrconf_add_dev(dev);
2203         if (IS_ERR(idev))
2204                 return PTR_ERR(idev);
2205
2206         scope = ipv6_addr_scope(pfx);
2207
2208         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2209         if (addrconf_finite_timeout(timeout)) {
2210                 expires = jiffies_to_clock_t(timeout * HZ);
2211                 valid_lft = timeout;
2212                 flags = RTF_EXPIRES;
2213         } else {
2214                 expires = 0;
2215                 flags = 0;
2216                 ifa_flags |= IFA_F_PERMANENT;
2217         }
2218
2219         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2220         if (addrconf_finite_timeout(timeout)) {
2221                 if (timeout == 0)
2222                         ifa_flags |= IFA_F_DEPRECATED;
2223                 prefered_lft = timeout;
2224         }
2225
2226         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2227
2228         if (!IS_ERR(ifp)) {
2229                 spin_lock_bh(&ifp->lock);
2230                 ifp->valid_lft = valid_lft;
2231                 ifp->prefered_lft = prefered_lft;
2232                 ifp->tstamp = jiffies;
2233                 spin_unlock_bh(&ifp->lock);
2234
2235                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2236                                       expires, flags);
2237                 /*
2238                  * Note that section 3.1 of RFC 4429 indicates
2239                  * that the Optimistic flag should not be set for
2240                  * manually configured addresses
2241                  */
2242                 addrconf_dad_start(ifp, 0);
2243                 in6_ifa_put(ifp);
2244                 addrconf_verify(0);
2245                 return 0;
2246         }
2247
2248         return PTR_ERR(ifp);
2249 }
2250
2251 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2252                           unsigned int plen)
2253 {
2254         struct inet6_ifaddr *ifp;
2255         struct inet6_dev *idev;
2256         struct net_device *dev;
2257
2258         if (plen > 128)
2259                 return -EINVAL;
2260
2261         dev = __dev_get_by_index(net, ifindex);
2262         if (!dev)
2263                 return -ENODEV;
2264
2265         if ((idev = __in6_dev_get(dev)) == NULL)
2266                 return -ENXIO;
2267
2268         read_lock_bh(&idev->lock);
2269         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2270                 if (ifp->prefix_len == plen &&
2271                     ipv6_addr_equal(pfx, &ifp->addr)) {
2272                         in6_ifa_hold(ifp);
2273                         read_unlock_bh(&idev->lock);
2274
2275                         ipv6_del_addr(ifp);
2276
2277                         /* If the last address is deleted administratively,
2278                            disable IPv6 on this interface.
2279                          */
2280                         if (list_empty(&idev->addr_list))
2281                                 addrconf_ifdown(idev->dev, 1);
2282                         return 0;
2283                 }
2284         }
2285         read_unlock_bh(&idev->lock);
2286         return -EADDRNOTAVAIL;
2287 }
2288
2289
2290 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2291 {
2292         struct in6_ifreq ireq;
2293         int err;
2294
2295         if (!capable(CAP_NET_ADMIN))
2296                 return -EPERM;
2297
2298         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2299                 return -EFAULT;
2300
2301         rtnl_lock();
2302         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2303                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2304                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2305         rtnl_unlock();
2306         return err;
2307 }
2308
2309 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2310 {
2311         struct in6_ifreq ireq;
2312         int err;
2313
2314         if (!capable(CAP_NET_ADMIN))
2315                 return -EPERM;
2316
2317         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2318                 return -EFAULT;
2319
2320         rtnl_lock();
2321         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2322                              ireq.ifr6_prefixlen);
2323         rtnl_unlock();
2324         return err;
2325 }
2326
2327 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2328                      int plen, int scope)
2329 {
2330         struct inet6_ifaddr *ifp;
2331
2332         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2333         if (!IS_ERR(ifp)) {
2334                 spin_lock_bh(&ifp->lock);
2335                 ifp->flags &= ~IFA_F_TENTATIVE;
2336                 spin_unlock_bh(&ifp->lock);
2337                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2338                 in6_ifa_put(ifp);
2339         }
2340 }
2341
2342 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2343 static void sit_add_v4_addrs(struct inet6_dev *idev)
2344 {
2345         struct in6_addr addr;
2346         struct net_device *dev;
2347         struct net *net = dev_net(idev->dev);
2348         int scope;
2349
2350         ASSERT_RTNL();
2351
2352         memset(&addr, 0, sizeof(struct in6_addr));
2353         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2354
2355         if (idev->dev->flags&IFF_POINTOPOINT) {
2356                 addr.s6_addr32[0] = htonl(0xfe800000);
2357                 scope = IFA_LINK;
2358         } else {
2359                 scope = IPV6_ADDR_COMPATv4;
2360         }
2361
2362         if (addr.s6_addr32[3]) {
2363                 add_addr(idev, &addr, 128, scope);
2364                 return;
2365         }
2366
2367         for_each_netdev(net, dev) {
2368                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2369                 if (in_dev && (dev->flags & IFF_UP)) {
2370                         struct in_ifaddr * ifa;
2371
2372                         int flag = scope;
2373
2374                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2375                                 int plen;
2376
2377                                 addr.s6_addr32[3] = ifa->ifa_local;
2378
2379                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2380                                         continue;
2381                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2382                                         if (idev->dev->flags&IFF_POINTOPOINT)
2383                                                 continue;
2384                                         flag |= IFA_HOST;
2385                                 }
2386                                 if (idev->dev->flags&IFF_POINTOPOINT)
2387                                         plen = 64;
2388                                 else
2389                                         plen = 96;
2390
2391                                 add_addr(idev, &addr, plen, flag);
2392                         }
2393                 }
2394         }
2395 }
2396 #endif
2397
2398 static void init_loopback(struct net_device *dev)
2399 {
2400         struct inet6_dev  *idev;
2401
2402         /* ::1 */
2403
2404         ASSERT_RTNL();
2405
2406         if ((idev = ipv6_find_idev(dev)) == NULL) {
2407                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2408                 return;
2409         }
2410
2411         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2412 }
2413
2414 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2415 {
2416         struct inet6_ifaddr * ifp;
2417         u32 addr_flags = IFA_F_PERMANENT;
2418
2419 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2420         if (idev->cnf.optimistic_dad &&
2421             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2422                 addr_flags |= IFA_F_OPTIMISTIC;
2423 #endif
2424
2425
2426         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2427         if (!IS_ERR(ifp)) {
2428                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2429                 addrconf_dad_start(ifp, 0);
2430                 in6_ifa_put(ifp);
2431         }
2432 }
2433
2434 static void addrconf_dev_config(struct net_device *dev)
2435 {
2436         struct in6_addr addr;
2437         struct inet6_dev    * idev;
2438
2439         ASSERT_RTNL();
2440
2441         if ((dev->type != ARPHRD_ETHER) &&
2442             (dev->type != ARPHRD_FDDI) &&
2443             (dev->type != ARPHRD_IEEE802_TR) &&
2444             (dev->type != ARPHRD_ARCNET) &&
2445             (dev->type != ARPHRD_INFINIBAND)) {
2446                 /* Alas, we support only Ethernet autoconfiguration. */
2447                 return;
2448         }
2449
2450         idev = addrconf_add_dev(dev);
2451         if (IS_ERR(idev))
2452                 return;
2453
2454         memset(&addr, 0, sizeof(struct in6_addr));
2455         addr.s6_addr32[0] = htonl(0xFE800000);
2456
2457         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2458                 addrconf_add_linklocal(idev, &addr);
2459 }
2460
2461 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2462 static void addrconf_sit_config(struct net_device *dev)
2463 {
2464         struct inet6_dev *idev;
2465
2466         ASSERT_RTNL();
2467
2468         /*
2469          * Configure the tunnel with one of our IPv4
2470          * addresses... we should configure all of
2471          * our v4 addrs in the tunnel
2472          */
2473
2474         if ((idev = ipv6_find_idev(dev)) == NULL) {
2475                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2476                 return;
2477         }
2478
2479         if (dev->priv_flags & IFF_ISATAP) {
2480                 struct in6_addr addr;
2481
2482                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2483                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2484                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2485                         addrconf_add_linklocal(idev, &addr);
2486                 return;
2487         }
2488
2489         sit_add_v4_addrs(idev);
2490
2491         if (dev->flags&IFF_POINTOPOINT) {
2492                 addrconf_add_mroute(dev);
2493                 addrconf_add_lroute(dev);
2494         } else
2495                 sit_route_add(dev);
2496 }
2497 #endif
2498
2499 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2500 static void addrconf_gre_config(struct net_device *dev)
2501 {
2502         struct inet6_dev *idev;
2503         struct in6_addr addr;
2504
2505         pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2506
2507         ASSERT_RTNL();
2508
2509         if ((idev = ipv6_find_idev(dev)) == NULL) {
2510                 printk(KERN_DEBUG "init gre: add_dev failed\n");
2511                 return;
2512         }
2513
2514         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2515         addrconf_prefix_route(&addr, 64, dev, 0, 0);
2516
2517         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2518                 addrconf_add_linklocal(idev, &addr);
2519 }
2520 #endif
2521
2522 static inline int
2523 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2524 {
2525         struct in6_addr lladdr;
2526
2527         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2528                 addrconf_add_linklocal(idev, &lladdr);
2529                 return 0;
2530         }
2531         return -1;
2532 }
2533
2534 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2535 {
2536         struct net_device *link_dev;
2537         struct net *net = dev_net(idev->dev);
2538
2539         /* first try to inherit the link-local address from the link device */
2540         if (idev->dev->iflink &&
2541             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2542                 if (!ipv6_inherit_linklocal(idev, link_dev))
2543                         return;
2544         }
2545         /* then try to inherit it from any device */
2546         for_each_netdev(net, link_dev) {
2547                 if (!ipv6_inherit_linklocal(idev, link_dev))
2548                         return;
2549         }
2550         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2551 }
2552
2553 /*
2554  * Autoconfigure tunnel with a link-local address so routing protocols,
2555  * DHCPv6, MLD etc. can be run over the virtual link
2556  */
2557
2558 static void addrconf_ip6_tnl_config(struct net_device *dev)
2559 {
2560         struct inet6_dev *idev;
2561
2562         ASSERT_RTNL();
2563
2564         idev = addrconf_add_dev(dev);
2565         if (IS_ERR(idev)) {
2566                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2567                 return;
2568         }
2569         ip6_tnl_add_linklocal(idev);
2570 }
2571
2572 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2573                            void * data)
2574 {
2575         struct net_device *dev = (struct net_device *) data;
2576         struct inet6_dev *idev = __in6_dev_get(dev);
2577         int run_pending = 0;
2578         int err;
2579
2580         switch (event) {
2581         case NETDEV_REGISTER:
2582                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2583                         idev = ipv6_add_dev(dev);
2584                         if (!idev)
2585                                 return notifier_from_errno(-ENOMEM);
2586                 }
2587                 break;
2588
2589         case NETDEV_UP:
2590         case NETDEV_CHANGE:
2591                 if (dev->flags & IFF_SLAVE)
2592                         break;
2593
2594                 if (event == NETDEV_UP) {
2595                         if (!addrconf_qdisc_ok(dev)) {
2596                                 /* device is not ready yet. */
2597                                 printk(KERN_INFO
2598                                         "ADDRCONF(NETDEV_UP): %s: "
2599                                         "link is not ready\n",
2600                                         dev->name);
2601                                 break;
2602                         }
2603
2604                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2605                                 idev = ipv6_add_dev(dev);
2606
2607                         if (idev) {
2608                                 idev->if_flags |= IF_READY;
2609                                 run_pending = 1;
2610                         }
2611                 } else {
2612                         if (!addrconf_qdisc_ok(dev)) {
2613                                 /* device is still not ready. */
2614                                 break;
2615                         }
2616
2617                         if (idev) {
2618                                 if (idev->if_flags & IF_READY)
2619                                         /* device is already configured. */
2620                                         break;
2621                                 idev->if_flags |= IF_READY;
2622                         }
2623
2624                         printk(KERN_INFO
2625                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2626                                         "link becomes ready\n",
2627                                         dev->name);
2628
2629                         run_pending = 1;
2630                 }
2631
2632                 switch (dev->type) {
2633 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2634                 case ARPHRD_SIT:
2635                         addrconf_sit_config(dev);
2636                         break;
2637 #endif
2638 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2639                 case ARPHRD_IPGRE:
2640                         addrconf_gre_config(dev);
2641                         break;
2642 #endif
2643                 case ARPHRD_TUNNEL6:
2644                         addrconf_ip6_tnl_config(dev);
2645                         break;
2646                 case ARPHRD_LOOPBACK:
2647                         init_loopback(dev);
2648                         break;
2649
2650                 default:
2651                         addrconf_dev_config(dev);
2652                         break;
2653                 }
2654
2655                 if (idev) {
2656                         if (run_pending)
2657                                 addrconf_dad_run(idev);
2658
2659                         /*
2660                          * If the MTU changed during the interface down,
2661                          * when the interface up, the changed MTU must be
2662                          * reflected in the idev as well as routers.
2663                          */
2664                         if (idev->cnf.mtu6 != dev->mtu &&
2665                             dev->mtu >= IPV6_MIN_MTU) {
2666                                 rt6_mtu_change(dev, dev->mtu);
2667                                 idev->cnf.mtu6 = dev->mtu;
2668                         }
2669                         idev->tstamp = jiffies;
2670                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2671
2672                         /*
2673                          * If the changed mtu during down is lower than
2674                          * IPV6_MIN_MTU stop IPv6 on this interface.
2675                          */
2676                         if (dev->mtu < IPV6_MIN_MTU)
2677                                 addrconf_ifdown(dev, 1);
2678                 }
2679                 break;
2680
2681         case NETDEV_CHANGEMTU:
2682                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2683                         rt6_mtu_change(dev, dev->mtu);
2684                         idev->cnf.mtu6 = dev->mtu;
2685                         break;
2686                 }
2687
2688                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2689                         idev = ipv6_add_dev(dev);
2690                         if (idev)
2691                                 break;
2692                 }
2693
2694                 /*
2695                  * MTU falled under IPV6_MIN_MTU.
2696                  * Stop IPv6 on this interface.
2697                  */
2698
2699         case NETDEV_DOWN:
2700         case NETDEV_UNREGISTER:
2701                 /*
2702                  *      Remove all addresses from this interface.
2703                  */
2704                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2705                 break;
2706
2707         case NETDEV_CHANGENAME:
2708                 if (idev) {
2709                         snmp6_unregister_dev(idev);
2710                         addrconf_sysctl_unregister(idev);
2711                         addrconf_sysctl_register(idev);
2712                         err = snmp6_register_dev(idev);
2713                         if (err)
2714                                 return notifier_from_errno(err);
2715                 }
2716                 break;
2717
2718         case NETDEV_PRE_TYPE_CHANGE:
2719         case NETDEV_POST_TYPE_CHANGE:
2720                 addrconf_type_change(dev, event);
2721                 break;
2722         }
2723
2724         return NOTIFY_OK;
2725 }
2726
2727 /*
2728  *      addrconf module should be notified of a device going up
2729  */
2730 static struct notifier_block ipv6_dev_notf = {
2731         .notifier_call = addrconf_notify,
2732 };
2733
2734 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2735 {
2736         struct inet6_dev *idev;
2737         ASSERT_RTNL();
2738
2739         idev = __in6_dev_get(dev);
2740
2741         if (event == NETDEV_POST_TYPE_CHANGE)
2742                 ipv6_mc_remap(idev);
2743         else if (event == NETDEV_PRE_TYPE_CHANGE)
2744                 ipv6_mc_unmap(idev);
2745 }
2746
2747 static int addrconf_ifdown(struct net_device *dev, int how)
2748 {
2749         struct net *net = dev_net(dev);
2750         struct inet6_dev *idev;
2751         struct inet6_ifaddr *ifa;
2752         int state, i;
2753
2754         ASSERT_RTNL();
2755
2756         rt6_ifdown(net, dev);
2757         neigh_ifdown(&nd_tbl, dev);
2758
2759         idev = __in6_dev_get(dev);
2760         if (idev == NULL)
2761                 return -ENODEV;
2762
2763         /*
2764          * Step 1: remove reference to ipv6 device from parent device.
2765          *         Do not dev_put!
2766          */
2767         if (how) {
2768                 idev->dead = 1;
2769
2770                 /* protected by rtnl_lock */
2771                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2772
2773                 /* Step 1.5: remove snmp6 entry */
2774                 snmp6_unregister_dev(idev);
2775
2776         }
2777
2778         /* Step 2: clear hash table */
2779         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2780                 struct hlist_head *h = &inet6_addr_lst[i];
2781                 struct hlist_node *n;
2782
2783                 spin_lock_bh(&addrconf_hash_lock);
2784         restart:
2785                 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2786                         if (ifa->idev == idev) {
2787                                 hlist_del_init_rcu(&ifa->addr_lst);
2788                                 addrconf_del_timer(ifa);
2789                                 goto restart;
2790                         }
2791                 }
2792                 spin_unlock_bh(&addrconf_hash_lock);
2793         }
2794
2795         write_lock_bh(&idev->lock);
2796
2797         /* Step 2: clear flags for stateless addrconf */
2798         if (!how)
2799                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2800
2801 #ifdef CONFIG_IPV6_PRIVACY
2802         if (how && del_timer(&idev->regen_timer))
2803                 in6_dev_put(idev);
2804
2805         /* Step 3: clear tempaddr list */
2806         while (!list_empty(&idev->tempaddr_list)) {
2807                 ifa = list_first_entry(&idev->tempaddr_list,
2808                                        struct inet6_ifaddr, tmp_list);
2809                 list_del(&ifa->tmp_list);
2810                 write_unlock_bh(&idev->lock);
2811                 spin_lock_bh(&ifa->lock);
2812
2813                 if (ifa->ifpub) {
2814                         in6_ifa_put(ifa->ifpub);
2815                         ifa->ifpub = NULL;
2816                 }
2817                 spin_unlock_bh(&ifa->lock);
2818                 in6_ifa_put(ifa);
2819                 write_lock_bh(&idev->lock);
2820         }
2821 #endif
2822
2823         while (!list_empty(&idev->addr_list)) {
2824                 ifa = list_first_entry(&idev->addr_list,
2825                                        struct inet6_ifaddr, if_list);
2826                 addrconf_del_timer(ifa);
2827
2828                 list_del(&ifa->if_list);
2829
2830                 write_unlock_bh(&idev->lock);
2831
2832                 spin_lock_bh(&ifa->state_lock);
2833                 state = ifa->state;
2834                 ifa->state = INET6_IFADDR_STATE_DEAD;
2835                 spin_unlock_bh(&ifa->state_lock);
2836
2837                 if (state != INET6_IFADDR_STATE_DEAD) {
2838                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
2839                         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2840                 }
2841                 in6_ifa_put(ifa);
2842
2843                 write_lock_bh(&idev->lock);
2844         }
2845
2846         write_unlock_bh(&idev->lock);
2847
2848         /* Step 5: Discard multicast list */
2849         if (how)
2850                 ipv6_mc_destroy_dev(idev);
2851         else
2852                 ipv6_mc_down(idev);
2853
2854         idev->tstamp = jiffies;
2855
2856         /* Last: Shot the device (if unregistered) */
2857         if (how) {
2858                 addrconf_sysctl_unregister(idev);
2859                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2860                 neigh_ifdown(&nd_tbl, dev);
2861                 in6_dev_put(idev);
2862         }
2863         return 0;
2864 }
2865
2866 static void addrconf_rs_timer(unsigned long data)
2867 {
2868         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2869         struct inet6_dev *idev = ifp->idev;
2870
2871         read_lock(&idev->lock);
2872         if (idev->dead || !(idev->if_flags & IF_READY))
2873                 goto out;
2874
2875         if (idev->cnf.forwarding)
2876                 goto out;
2877
2878         /* Announcement received after solicitation was sent */
2879         if (idev->if_flags & IF_RA_RCVD)
2880                 goto out;
2881
2882         spin_lock(&ifp->lock);
2883         if (ifp->probes++ < idev->cnf.rtr_solicits) {
2884                 /* The wait after the last probe can be shorter */
2885                 addrconf_mod_timer(ifp, AC_RS,
2886                                    (ifp->probes == idev->cnf.rtr_solicits) ?
2887                                    idev->cnf.rtr_solicit_delay :
2888                                    idev->cnf.rtr_solicit_interval);
2889                 spin_unlock(&ifp->lock);
2890
2891                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2892         } else {
2893                 spin_unlock(&ifp->lock);
2894                 /*
2895                  * Note: we do not support deprecated "all on-link"
2896                  * assumption any longer.
2897                  */
2898                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2899                        idev->dev->name);
2900         }
2901
2902 out:
2903         read_unlock(&idev->lock);
2904         in6_ifa_put(ifp);
2905 }
2906
2907 /*
2908  *      Duplicate Address Detection
2909  */
2910 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2911 {
2912         unsigned long rand_num;
2913         struct inet6_dev *idev = ifp->idev;
2914
2915         if (ifp->flags & IFA_F_OPTIMISTIC)
2916                 rand_num = 0;
2917         else
2918                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2919
2920         ifp->probes = idev->cnf.dad_transmits;
2921         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2922 }
2923
2924 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2925 {
2926         struct inet6_dev *idev = ifp->idev;
2927         struct net_device *dev = idev->dev;
2928
2929         addrconf_join_solict(dev, &ifp->addr);
2930
2931         net_srandom(ifp->addr.s6_addr32[3]);
2932
2933         read_lock_bh(&idev->lock);
2934         spin_lock(&ifp->lock);
2935         if (ifp->state == INET6_IFADDR_STATE_DEAD)
2936                 goto out;
2937
2938         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2939             idev->cnf.accept_dad < 1 ||
2940             !(ifp->flags&IFA_F_TENTATIVE) ||
2941             ifp->flags & IFA_F_NODAD) {
2942                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2943                 spin_unlock(&ifp->lock);
2944                 read_unlock_bh(&idev->lock);
2945
2946                 addrconf_dad_completed(ifp);
2947                 return;
2948         }
2949
2950         if (!(idev->if_flags & IF_READY)) {
2951                 spin_unlock(&ifp->lock);
2952                 read_unlock_bh(&idev->lock);
2953                 /*
2954                  * If the device is not ready:
2955                  * - keep it tentative if it is a permanent address.
2956                  * - otherwise, kill it.
2957                  */
2958                 in6_ifa_hold(ifp);
2959                 addrconf_dad_stop(ifp, 0);
2960                 return;
2961         }
2962
2963         /*
2964          * Optimistic nodes can start receiving
2965          * Frames right away
2966          */
2967         if (ifp->flags & IFA_F_OPTIMISTIC)
2968                 ip6_ins_rt(ifp->rt);
2969
2970         addrconf_dad_kick(ifp);
2971 out:
2972         spin_unlock(&ifp->lock);
2973         read_unlock_bh(&idev->lock);
2974 }
2975
2976 static void addrconf_dad_timer(unsigned long data)
2977 {
2978         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2979         struct inet6_dev *idev = ifp->idev;
2980         struct in6_addr mcaddr;
2981
2982         if (!ifp->probes && addrconf_dad_end(ifp))
2983                 goto out;
2984
2985         read_lock(&idev->lock);
2986         if (idev->dead || !(idev->if_flags & IF_READY)) {
2987                 read_unlock(&idev->lock);
2988                 goto out;
2989         }
2990
2991         spin_lock(&ifp->lock);
2992         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2993                 spin_unlock(&ifp->lock);
2994                 read_unlock(&idev->lock);
2995                 goto out;
2996         }
2997
2998         if (ifp->probes == 0) {
2999                 /*
3000                  * DAD was successful
3001                  */
3002
3003                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3004                 spin_unlock(&ifp->lock);
3005                 read_unlock(&idev->lock);
3006
3007                 addrconf_dad_completed(ifp);
3008
3009                 goto out;
3010         }
3011
3012         ifp->probes--;
3013         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3014         spin_unlock(&ifp->lock);
3015         read_unlock(&idev->lock);
3016
3017         /* send a neighbour solicitation for our addr */
3018         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3019         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3020 out:
3021         in6_ifa_put(ifp);
3022 }
3023
3024 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3025 {
3026         struct net_device *dev = ifp->idev->dev;
3027
3028         /*
3029          *      Configure the address for reception. Now it is valid.
3030          */
3031
3032         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3033
3034         /* If added prefix is link local and we are prepared to process
3035            router advertisements, start sending router solicitations.
3036          */
3037
3038         if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3039              ifp->idev->cnf.accept_ra == 2) &&
3040             ifp->idev->cnf.rtr_solicits > 0 &&
3041             (dev->flags&IFF_LOOPBACK) == 0 &&
3042             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3043                 /*
3044                  *      If a host as already performed a random delay
3045                  *      [...] as part of DAD [...] there is no need
3046                  *      to delay again before sending the first RS
3047                  */
3048                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3049
3050                 spin_lock_bh(&ifp->lock);
3051                 ifp->probes = 1;
3052                 ifp->idev->if_flags |= IF_RS_SENT;
3053                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3054                 spin_unlock_bh(&ifp->lock);
3055         }
3056 }
3057
3058 static void addrconf_dad_run(struct inet6_dev *idev)
3059 {
3060         struct inet6_ifaddr *ifp;
3061
3062         read_lock_bh(&idev->lock);
3063         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3064                 spin_lock(&ifp->lock);
3065                 if (ifp->flags & IFA_F_TENTATIVE &&
3066                     ifp->state == INET6_IFADDR_STATE_DAD)
3067                         addrconf_dad_kick(ifp);
3068                 spin_unlock(&ifp->lock);
3069         }
3070         read_unlock_bh(&idev->lock);
3071 }
3072
3073 #ifdef CONFIG_PROC_FS
3074 struct if6_iter_state {
3075         struct seq_net_private p;
3076         int bucket;
3077         int offset;
3078 };
3079
3080 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3081 {
3082         struct inet6_ifaddr *ifa = NULL;
3083         struct if6_iter_state *state = seq->private;
3084         struct net *net = seq_file_net(seq);
3085         int p = 0;
3086
3087         /* initial bucket if pos is 0 */
3088         if (pos == 0) {
3089                 state->bucket = 0;
3090                 state->offset = 0;
3091         }
3092
3093         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3094                 struct hlist_node *n;
3095                 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3096                                          addr_lst) {
3097                         /* sync with offset */
3098                         if (p < state->offset) {
3099                                 p++;
3100                                 continue;
3101                         }
3102                         state->offset++;
3103                         if (net_eq(dev_net(ifa->idev->dev), net))
3104                                 return ifa;
3105                 }
3106
3107                 /* prepare for next bucket */
3108                 state->offset = 0;
3109                 p = 0;
3110         }
3111         return NULL;
3112 }
3113
3114 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3115                                          struct inet6_ifaddr *ifa)
3116 {
3117         struct if6_iter_state *state = seq->private;
3118         struct net *net = seq_file_net(seq);
3119         struct hlist_node *n = &ifa->addr_lst;
3120
3121         hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3122                 state->offset++;
3123                 if (net_eq(dev_net(ifa->idev->dev), net))
3124                         return ifa;
3125         }
3126
3127         while (++state->bucket < IN6_ADDR_HSIZE) {
3128                 state->offset = 0;
3129                 hlist_for_each_entry_rcu_bh(ifa, n,
3130                                      &inet6_addr_lst[state->bucket], addr_lst) {
3131                         state->offset++;
3132                         if (net_eq(dev_net(ifa->idev->dev), net))
3133                                 return ifa;
3134                 }
3135         }
3136
3137         return NULL;
3138 }
3139
3140 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3141         __acquires(rcu_bh)
3142 {
3143         rcu_read_lock_bh();
3144         return if6_get_first(seq, *pos);
3145 }
3146
3147 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3148 {
3149         struct inet6_ifaddr *ifa;
3150
3151         ifa = if6_get_next(seq, v);
3152         ++*pos;
3153         return ifa;
3154 }
3155
3156 static void if6_seq_stop(struct seq_file *seq, void *v)
3157         __releases(rcu_bh)
3158 {
3159         rcu_read_unlock_bh();
3160 }
3161
3162 static int if6_seq_show(struct seq_file *seq, void *v)
3163 {
3164         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3165         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3166                    &ifp->addr,
3167                    ifp->idev->dev->ifindex,
3168                    ifp->prefix_len,
3169                    ifp->scope,
3170                    ifp->flags,
3171                    ifp->idev->dev->name);
3172         return 0;
3173 }
3174
3175 static const struct seq_operations if6_seq_ops = {
3176         .start  = if6_seq_start,
3177         .next   = if6_seq_next,
3178         .show   = if6_seq_show,
3179         .stop   = if6_seq_stop,
3180 };
3181
3182 static int if6_seq_open(struct inode *inode, struct file *file)
3183 {
3184         return seq_open_net(inode, file, &if6_seq_ops,
3185                             sizeof(struct if6_iter_state));
3186 }
3187
3188 static const struct file_operations if6_fops = {
3189         .owner          = THIS_MODULE,
3190         .open           = if6_seq_open,
3191         .read           = seq_read,
3192         .llseek         = seq_lseek,
3193         .release        = seq_release_net,
3194 };
3195
3196 static int __net_init if6_proc_net_init(struct net *net)
3197 {
3198         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3199                 return -ENOMEM;
3200         return 0;
3201 }
3202
3203 static void __net_exit if6_proc_net_exit(struct net *net)
3204 {
3205        proc_net_remove(net, "if_inet6");
3206 }
3207
3208 static struct pernet_operations if6_proc_net_ops = {
3209        .init = if6_proc_net_init,
3210        .exit = if6_proc_net_exit,
3211 };
3212
3213 int __init if6_proc_init(void)
3214 {
3215         return register_pernet_subsys(&if6_proc_net_ops);
3216 }
3217
3218 void if6_proc_exit(void)
3219 {
3220         unregister_pernet_subsys(&if6_proc_net_ops);
3221 }
3222 #endif  /* CONFIG_PROC_FS */
3223
3224 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3225 /* Check if address is a home address configured on any interface. */
3226 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3227 {
3228         int ret = 0;
3229         struct inet6_ifaddr *ifp = NULL;
3230         struct hlist_node *n;
3231         unsigned int hash = ipv6_addr_hash(addr);
3232
3233         rcu_read_lock_bh();
3234         hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3235                 if (!net_eq(dev_net(ifp->idev->dev), net))
3236                         continue;
3237                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3238                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3239                         ret = 1;
3240                         break;
3241                 }
3242         }
3243         rcu_read_unlock_bh();
3244         return ret;
3245 }
3246 #endif
3247
3248 /*
3249  *      Periodic address status verification
3250  */
3251
3252 static void addrconf_verify(unsigned long foo)
3253 {
3254         unsigned long now, next, next_sec, next_sched;
3255         struct inet6_ifaddr *ifp;
3256         struct hlist_node *node;
3257         int i;
3258
3259         rcu_read_lock_bh();
3260         spin_lock(&addrconf_verify_lock);
3261         now = jiffies;
3262         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3263
3264         del_timer(&addr_chk_timer);
3265
3266         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3267 restart:
3268                 hlist_for_each_entry_rcu_bh(ifp, node,
3269                                          &inet6_addr_lst[i], addr_lst) {
3270                         unsigned long age;
3271
3272                         if (ifp->flags & IFA_F_PERMANENT)
3273                                 continue;
3274
3275                         spin_lock(&ifp->lock);
3276                         /* We try to batch several events at once. */
3277                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3278
3279                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3280                             age >= ifp->valid_lft) {
3281                                 spin_unlock(&ifp->lock);
3282                                 in6_ifa_hold(ifp);
3283                                 ipv6_del_addr(ifp);
3284                                 goto restart;
3285                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3286                                 spin_unlock(&ifp->lock);
3287                                 continue;
3288                         } else if (age >= ifp->prefered_lft) {
3289                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3290                                 int deprecate = 0;
3291
3292                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3293                                         deprecate = 1;
3294                                         ifp->flags |= IFA_F_DEPRECATED;
3295                                 }
3296
3297                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3298                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3299
3300                                 spin_unlock(&ifp->lock);
3301
3302                                 if (deprecate) {
3303                                         in6_ifa_hold(ifp);
3304
3305                                         ipv6_ifa_notify(0, ifp);
3306                                         in6_ifa_put(ifp);
3307                                         goto restart;
3308                                 }
3309 #ifdef CONFIG_IPV6_PRIVACY
3310                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3311                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3312                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3313                                         ifp->idev->cnf.dad_transmits *
3314                                         ifp->idev->nd_parms->retrans_time / HZ;
3315
3316                                 if (age >= ifp->prefered_lft - regen_advance) {
3317                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3318                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3319                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3320                                         if (!ifp->regen_count && ifpub) {
3321                                                 ifp->regen_count++;
3322                                                 in6_ifa_hold(ifp);
3323                                                 in6_ifa_hold(ifpub);
3324                                                 spin_unlock(&ifp->lock);
3325
3326                                                 spin_lock(&ifpub->lock);
3327                                                 ifpub->regen_count = 0;
3328                                                 spin_unlock(&ifpub->lock);
3329                                                 ipv6_create_tempaddr(ifpub, ifp);
3330                                                 in6_ifa_put(ifpub);
3331                                                 in6_ifa_put(ifp);
3332                                                 goto restart;
3333                                         }
3334                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3335                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3336                                 spin_unlock(&ifp->lock);
3337 #endif
3338                         } else {
3339                                 /* ifp->prefered_lft <= ifp->valid_lft */
3340                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3341                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3342                                 spin_unlock(&ifp->lock);
3343                         }
3344                 }
3345         }
3346
3347         next_sec = round_jiffies_up(next);
3348         next_sched = next;
3349
3350         /* If rounded timeout is accurate enough, accept it. */
3351         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3352                 next_sched = next_sec;
3353
3354         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3355         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3356                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3357
3358         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3359               now, next, next_sec, next_sched));
3360
3361         addr_chk_timer.expires = next_sched;
3362         add_timer(&addr_chk_timer);
3363         spin_unlock(&addrconf_verify_lock);
3364         rcu_read_unlock_bh();
3365 }
3366
3367 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3368 {
3369         struct in6_addr *pfx = NULL;
3370
3371         if (addr)
3372                 pfx = nla_data(addr);
3373
3374         if (local) {
3375                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3376                         pfx = NULL;
3377                 else
3378                         pfx = nla_data(local);
3379         }
3380
3381         return pfx;
3382 }
3383
3384 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3385         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3386         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3387         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3388 };
3389
3390 static int
3391 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3392 {
3393         struct net *net = sock_net(skb->sk);
3394         struct ifaddrmsg *ifm;
3395         struct nlattr *tb[IFA_MAX+1];
3396         struct in6_addr *pfx;
3397         int err;
3398
3399         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3400         if (err < 0)
3401                 return err;
3402
3403         ifm = nlmsg_data(nlh);
3404         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3405         if (pfx == NULL)
3406                 return -EINVAL;
3407
3408         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3409 }
3410
3411 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3412                              u32 prefered_lft, u32 valid_lft)
3413 {
3414         u32 flags;
3415         clock_t expires;
3416         unsigned long timeout;
3417
3418         if (!valid_lft || (prefered_lft > valid_lft))
3419                 return -EINVAL;
3420
3421         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3422         if (addrconf_finite_timeout(timeout)) {
3423                 expires = jiffies_to_clock_t(timeout * HZ);
3424                 valid_lft = timeout;
3425                 flags = RTF_EXPIRES;
3426         } else {
3427                 expires = 0;
3428                 flags = 0;
3429                 ifa_flags |= IFA_F_PERMANENT;
3430         }
3431
3432         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3433         if (addrconf_finite_timeout(timeout)) {
3434                 if (timeout == 0)
3435                         ifa_flags |= IFA_F_DEPRECATED;
3436                 prefered_lft = timeout;
3437         }
3438
3439         spin_lock_bh(&ifp->lock);
3440         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3441         ifp->tstamp = jiffies;
3442         ifp->valid_lft = valid_lft;
3443         ifp->prefered_lft = prefered_lft;
3444
3445         spin_unlock_bh(&ifp->lock);
3446         if (!(ifp->flags&IFA_F_TENTATIVE))
3447                 ipv6_ifa_notify(0, ifp);
3448
3449         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3450                               expires, flags);
3451         addrconf_verify(0);
3452
3453         return 0;
3454 }
3455
3456 static int
3457 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3458 {
3459         struct net *net = sock_net(skb->sk);
3460         struct ifaddrmsg *ifm;
3461         struct nlattr *tb[IFA_MAX+1];
3462         struct in6_addr *pfx;
3463         struct inet6_ifaddr *ifa;
3464         struct net_device *dev;
3465         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3466         u8 ifa_flags;
3467         int err;
3468
3469         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3470         if (err < 0)
3471                 return err;
3472
3473         ifm = nlmsg_data(nlh);
3474         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3475         if (pfx == NULL)
3476                 return -EINVAL;
3477
3478         if (tb[IFA_CACHEINFO]) {
3479                 struct ifa_cacheinfo *ci;
3480
3481                 ci = nla_data(tb[IFA_CACHEINFO]);
3482                 valid_lft = ci->ifa_valid;
3483                 preferred_lft = ci->ifa_prefered;
3484         } else {
3485                 preferred_lft = INFINITY_LIFE_TIME;
3486                 valid_lft = INFINITY_LIFE_TIME;
3487         }
3488
3489         dev =  __dev_get_by_index(net, ifm->ifa_index);
3490         if (dev == NULL)
3491                 return -ENODEV;
3492
3493         /* We ignore other flags so far. */
3494         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3495
3496         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3497         if (ifa == NULL) {
3498                 /*
3499                  * It would be best to check for !NLM_F_CREATE here but
3500                  * userspace alreay relies on not having to provide this.
3501                  */
3502                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3503                                       ifm->ifa_prefixlen, ifa_flags,
3504                                       preferred_lft, valid_lft);
3505         }
3506
3507         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3508             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3509                 err = -EEXIST;
3510         else
3511                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3512
3513         in6_ifa_put(ifa);
3514
3515         return err;
3516 }
3517
3518 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3519                           u8 scope, int ifindex)
3520 {
3521         struct ifaddrmsg *ifm;
3522
3523         ifm = nlmsg_data(nlh);
3524         ifm->ifa_family = AF_INET6;
3525         ifm->ifa_prefixlen = prefixlen;
3526         ifm->ifa_flags = flags;
3527         ifm->ifa_scope = scope;
3528         ifm->ifa_index = ifindex;
3529 }
3530
3531 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3532                          unsigned long tstamp, u32 preferred, u32 valid)
3533 {
3534         struct ifa_cacheinfo ci;
3535
3536         ci.cstamp = cstamp_delta(cstamp);
3537         ci.tstamp = cstamp_delta(tstamp);
3538         ci.ifa_prefered = preferred;
3539         ci.ifa_valid = valid;
3540
3541         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3542 }
3543
3544 static inline int rt_scope(int ifa_scope)
3545 {
3546         if (ifa_scope & IFA_HOST)
3547                 return RT_SCOPE_HOST;
3548         else if (ifa_scope & IFA_LINK)
3549                 return RT_SCOPE_LINK;
3550         else if (ifa_scope & IFA_SITE)
3551                 return RT_SCOPE_SITE;
3552         else
3553                 return RT_SCOPE_UNIVERSE;
3554 }
3555
3556 static inline int inet6_ifaddr_msgsize(void)
3557 {
3558         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3559                + nla_total_size(16) /* IFA_ADDRESS */
3560                + nla_total_size(sizeof(struct ifa_cacheinfo));
3561 }
3562
3563 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3564                              u32 pid, u32 seq, int event, unsigned int flags)
3565 {
3566         struct nlmsghdr  *nlh;
3567         u32 preferred, valid;
3568
3569         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3570         if (nlh == NULL)
3571                 return -EMSGSIZE;
3572
3573         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3574                       ifa->idev->dev->ifindex);
3575
3576         if (!(ifa->flags&IFA_F_PERMANENT)) {
3577                 preferred = ifa->prefered_lft;
3578                 valid = ifa->valid_lft;
3579                 if (preferred != INFINITY_LIFE_TIME) {
3580                         long tval = (jiffies - ifa->tstamp)/HZ;
3581                         if (preferred > tval)
3582                                 preferred -= tval;
3583                         else
3584                                 preferred = 0;
3585                         if (valid != INFINITY_LIFE_TIME) {
3586                                 if (valid > tval)
3587                                         valid -= tval;
3588                                 else
3589                                         valid = 0;
3590                         }
3591                 }
3592         } else {
3593                 preferred = INFINITY_LIFE_TIME;
3594                 valid = INFINITY_LIFE_TIME;
3595         }
3596
3597         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3598             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3599                 nlmsg_cancel(skb, nlh);
3600                 return -EMSGSIZE;
3601         }
3602
3603         return nlmsg_end(skb, nlh);
3604 }
3605
3606 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3607                                 u32 pid, u32 seq, int event, u16 flags)
3608 {
3609         struct nlmsghdr  *nlh;
3610         u8 scope = RT_SCOPE_UNIVERSE;
3611         int ifindex = ifmca->idev->dev->ifindex;
3612
3613         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3614                 scope = RT_SCOPE_SITE;
3615
3616         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3617         if (nlh == NULL)
3618                 return -EMSGSIZE;
3619
3620         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3621         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3622             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3623                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3624                 nlmsg_cancel(skb, nlh);
3625                 return -EMSGSIZE;
3626         }
3627
3628         return nlmsg_end(skb, nlh);
3629 }
3630
3631 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3632                                 u32 pid, u32 seq, int event, unsigned int flags)
3633 {
3634         struct nlmsghdr  *nlh;
3635         u8 scope = RT_SCOPE_UNIVERSE;
3636         int ifindex = ifaca->aca_idev->dev->ifindex;
3637
3638         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3639                 scope = RT_SCOPE_SITE;
3640
3641         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3642         if (nlh == NULL)
3643                 return -EMSGSIZE;
3644
3645         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3646         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3647             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3648                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3649                 nlmsg_cancel(skb, nlh);
3650                 return -EMSGSIZE;
3651         }
3652
3653         return nlmsg_end(skb, nlh);
3654 }
3655
3656 enum addr_type_t {
3657         UNICAST_ADDR,
3658         MULTICAST_ADDR,
3659         ANYCAST_ADDR,
3660 };
3661
3662 /* called with rcu_read_lock() */
3663 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3664                           struct netlink_callback *cb, enum addr_type_t type,
3665                           int s_ip_idx, int *p_ip_idx)
3666 {
3667         struct ifmcaddr6 *ifmca;
3668         struct ifacaddr6 *ifaca;
3669         int err = 1;
3670         int ip_idx = *p_ip_idx;
3671
3672         read_lock_bh(&idev->lock);
3673         switch (type) {
3674         case UNICAST_ADDR: {
3675                 struct inet6_ifaddr *ifa;
3676
3677                 /* unicast address incl. temp addr */
3678                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3679                         if (++ip_idx < s_ip_idx)
3680                                 continue;
3681                         err = inet6_fill_ifaddr(skb, ifa,
3682                                                 NETLINK_CB(cb->skb).pid,
3683                                                 cb->nlh->nlmsg_seq,
3684                                                 RTM_NEWADDR,
3685                                                 NLM_F_MULTI);
3686                         if (err <= 0)
3687                                 break;
3688                 }
3689                 break;
3690         }
3691         case MULTICAST_ADDR:
3692                 /* multicast address */
3693                 for (ifmca = idev->mc_list; ifmca;
3694                      ifmca = ifmca->next, ip_idx++) {
3695                         if (ip_idx < s_ip_idx)
3696                                 continue;
3697                         err = inet6_fill_ifmcaddr(skb, ifmca,
3698                                                   NETLINK_CB(cb->skb).pid,
3699                                                   cb->nlh->nlmsg_seq,
3700                                                   RTM_GETMULTICAST,
3701                                                   NLM_F_MULTI);
3702                         if (err <= 0)
3703                                 break;
3704                 }
3705                 break;
3706         case ANYCAST_ADDR:
3707                 /* anycast address */
3708                 for (ifaca = idev->ac_list; ifaca;
3709                      ifaca = ifaca->aca_next, ip_idx++) {
3710                         if (ip_idx < s_ip_idx)
3711                                 continue;
3712                         err = inet6_fill_ifacaddr(skb, ifaca,
3713                                                   NETLINK_CB(cb->skb).pid,
3714                                                   cb->nlh->nlmsg_seq,
3715                                                   RTM_GETANYCAST,
3716                                                   NLM_F_MULTI);
3717                         if (err <= 0)
3718                                 break;
3719                 }
3720                 break;
3721         default:
3722                 break;
3723         }
3724         read_unlock_bh(&idev->lock);
3725         *p_ip_idx = ip_idx;
3726         return err;
3727 }
3728
3729 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3730                            enum addr_type_t type)
3731 {
3732         struct net *net = sock_net(skb->sk);
3733         int h, s_h;
3734         int idx, ip_idx;
3735         int s_idx, s_ip_idx;
3736         struct net_device *dev;
3737         struct inet6_dev *idev;
3738         struct hlist_head *head;
3739         struct hlist_node *node;
3740
3741         s_h = cb->args[0];
3742         s_idx = idx = cb->args[1];
3743         s_ip_idx = ip_idx = cb->args[2];
3744
3745         rcu_read_lock();
3746         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3747                 idx = 0;
3748                 head = &net->dev_index_head[h];
3749                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3750                         if (idx < s_idx)
3751                                 goto cont;
3752                         if (h > s_h || idx > s_idx)
3753                                 s_ip_idx = 0;
3754                         ip_idx = 0;
3755                         idev = __in6_dev_get(dev);
3756                         if (!idev)
3757                                 goto cont;
3758
3759                         if (in6_dump_addrs(idev, skb, cb, type,
3760                                            s_ip_idx, &ip_idx) <= 0)
3761                                 goto done;
3762 cont:
3763                         idx++;
3764                 }
3765         }
3766 done:
3767         rcu_read_unlock();
3768         cb->args[0] = h;
3769         cb->args[1] = idx;
3770         cb->args[2] = ip_idx;
3771
3772         return skb->len;
3773 }
3774
3775 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3776 {
3777         enum addr_type_t type = UNICAST_ADDR;
3778
3779         return inet6_dump_addr(skb, cb, type);
3780 }
3781
3782 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3783 {
3784         enum addr_type_t type = MULTICAST_ADDR;
3785
3786         return inet6_dump_addr(skb, cb, type);
3787 }
3788
3789
3790 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3791 {
3792         enum addr_type_t type = ANYCAST_ADDR;
3793
3794         return inet6_dump_addr(skb, cb, type);
3795 }
3796
3797 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3798                              void *arg)
3799 {
3800         struct net *net = sock_net(in_skb->sk);
3801         struct ifaddrmsg *ifm;
3802         struct nlattr *tb[IFA_MAX+1];
3803         struct in6_addr *addr = NULL;
3804         struct net_device *dev = NULL;
3805         struct inet6_ifaddr *ifa;
3806         struct sk_buff *skb;
3807         int err;
3808
3809         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3810         if (err < 0)
3811                 goto errout;
3812
3813         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3814         if (addr == NULL) {
3815                 err = -EINVAL;
3816                 goto errout;
3817         }
3818
3819         ifm = nlmsg_data(nlh);
3820         if (ifm->ifa_index)
3821                 dev = __dev_get_by_index(net, ifm->ifa_index);
3822
3823         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3824         if (!ifa) {
3825                 err = -EADDRNOTAVAIL;
3826                 goto errout;
3827         }
3828
3829         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3830         if (!skb) {
3831                 err = -ENOBUFS;
3832                 goto errout_ifa;
3833         }
3834
3835         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3836                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3837         if (err < 0) {
3838                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3839                 WARN_ON(err == -EMSGSIZE);
3840                 kfree_skb(skb);
3841                 goto errout_ifa;
3842         }
3843         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3844 errout_ifa:
3845         in6_ifa_put(ifa);
3846 errout:
3847         return err;
3848 }
3849
3850 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3851 {
3852         struct sk_buff *skb;
3853         struct net *net = dev_net(ifa->idev->dev);
3854         int err = -ENOBUFS;
3855
3856         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3857         if (skb == NULL)
3858                 goto errout;
3859
3860         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3861         if (err < 0) {
3862                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3863                 WARN_ON(err == -EMSGSIZE);
3864                 kfree_skb(skb);
3865                 goto errout;
3866         }
3867         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3868         return;
3869 errout:
3870         if (err < 0)
3871                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3872 }
3873
3874 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3875                                 __s32 *array, int bytes)
3876 {
3877         BUG_ON(bytes < (DEVCONF_MAX * 4));
3878
3879         memset(array, 0, bytes);
3880         array[DEVCONF_FORWARDING] = cnf->forwarding;
3881         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3882         array[DEVCONF_MTU6] = cnf->mtu6;
3883         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3884         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3885         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3886         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3887         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3888         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3889                 jiffies_to_msecs(cnf->rtr_solicit_interval);
3890         array[DEVCONF_RTR_SOLICIT_DELAY] =
3891                 jiffies_to_msecs(cnf->rtr_solicit_delay);
3892         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3893 #ifdef CONFIG_IPV6_PRIVACY
3894         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3895         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3896         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3897         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3898         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3899 #endif
3900         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3901         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3902         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3903 #ifdef CONFIG_IPV6_ROUTER_PREF
3904         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3905         array[DEVCONF_RTR_PROBE_INTERVAL] =
3906                 jiffies_to_msecs(cnf->rtr_probe_interval);
3907 #ifdef CONFIG_IPV6_ROUTE_INFO
3908         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3909 #endif
3910 #endif
3911         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3912         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3913 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3914         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3915 #endif
3916 #ifdef CONFIG_IPV6_MROUTE
3917         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3918 #endif
3919         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3920         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3921         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3922 }
3923
3924 static inline size_t inet6_ifla6_size(void)
3925 {
3926         return nla_total_size(4) /* IFLA_INET6_FLAGS */
3927              + nla_total_size(sizeof(struct ifla_cacheinfo))
3928              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3929              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3930              + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3931 }
3932
3933 static inline size_t inet6_if_nlmsg_size(void)
3934 {
3935         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3936                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3937                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3938                + nla_total_size(4) /* IFLA_MTU */
3939                + nla_total_size(4) /* IFLA_LINK */
3940                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3941 }
3942
3943 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3944                                       int items, int bytes)
3945 {
3946         int i;
3947         int pad = bytes - sizeof(u64) * items;
3948         BUG_ON(pad < 0);
3949
3950         /* Use put_unaligned() because stats may not be aligned for u64. */
3951         put_unaligned(items, &stats[0]);
3952         for (i = 1; i < items; i++)
3953                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3954
3955         memset(&stats[items], 0, pad);
3956 }
3957
3958 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3959                                       int items, int bytes, size_t syncpoff)
3960 {
3961         int i;
3962         int pad = bytes - sizeof(u64) * items;
3963         BUG_ON(pad < 0);
3964
3965         /* Use put_unaligned() because stats may not be aligned for u64. */
3966         put_unaligned(items, &stats[0]);
3967         for (i = 1; i < items; i++)
3968                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3969
3970         memset(&stats[items], 0, pad);
3971 }
3972
3973 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3974                              int bytes)
3975 {
3976         switch (attrtype) {
3977         case IFLA_INET6_STATS:
3978                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3979                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3980                 break;
3981         case IFLA_INET6_ICMP6STATS:
3982                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3983                 break;
3984         }
3985 }
3986
3987 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3988 {
3989         struct nlattr *nla;
3990         struct ifla_cacheinfo ci;
3991
3992         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3993
3994         ci.max_reasm_len = IPV6_MAXPLEN;
3995         ci.tstamp = cstamp_delta(idev->tstamp);
3996         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3997         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3998         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3999
4000         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4001         if (nla == NULL)
4002                 goto nla_put_failure;
4003         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4004
4005         /* XXX - MC not implemented */
4006
4007         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4008         if (nla == NULL)
4009                 goto nla_put_failure;
4010         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4011
4012         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4013         if (nla == NULL)
4014                 goto nla_put_failure;
4015         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4016
4017         return 0;
4018
4019 nla_put_failure:
4020         return -EMSGSIZE;
4021 }
4022
4023 static size_t inet6_get_link_af_size(const struct net_device *dev)
4024 {
4025         if (!__in6_dev_get(dev))
4026                 return 0;
4027
4028         return inet6_ifla6_size();
4029 }
4030
4031 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4032 {
4033         struct inet6_dev *idev = __in6_dev_get(dev);
4034
4035         if (!idev)
4036                 return -ENODATA;
4037
4038         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4039                 return -EMSGSIZE;
4040
4041         return 0;
4042 }
4043
4044 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4045                              u32 pid, u32 seq, int event, unsigned int flags)
4046 {
4047         struct net_device *dev = idev->dev;
4048         struct ifinfomsg *hdr;
4049         struct nlmsghdr *nlh;
4050         void *protoinfo;
4051
4052         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4053         if (nlh == NULL)
4054                 return -EMSGSIZE;
4055
4056         hdr = nlmsg_data(nlh);
4057         hdr->ifi_family = AF_INET6;
4058         hdr->__ifi_pad = 0;
4059         hdr->ifi_type = dev->type;
4060         hdr->ifi_index = dev->ifindex;
4061         hdr->ifi_flags = dev_get_flags(dev);
4062         hdr->ifi_change = 0;
4063
4064         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4065
4066         if (dev->addr_len)
4067                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4068
4069         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4070         if (dev->ifindex != dev->iflink)
4071                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4072
4073         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4074         if (protoinfo == NULL)
4075                 goto nla_put_failure;
4076
4077         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4078                 goto nla_put_failure;
4079
4080         nla_nest_end(skb, protoinfo);
4081         return nlmsg_end(skb, nlh);
4082
4083 nla_put_failure:
4084         nlmsg_cancel(skb, nlh);
4085         return -EMSGSIZE;
4086 }
4087
4088 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4089 {
4090         struct net *net = sock_net(skb->sk);
4091         int h, s_h;
4092         int idx = 0, s_idx;
4093         struct net_device *dev;
4094         struct inet6_dev *idev;
4095         struct hlist_head *head;
4096         struct hlist_node *node;
4097
4098         s_h = cb->args[0];
4099         s_idx = cb->args[1];
4100
4101         rcu_read_lock();
4102         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4103                 idx = 0;
4104                 head = &net->dev_index_head[h];
4105                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4106                         if (idx < s_idx)
4107                                 goto cont;
4108                         idev = __in6_dev_get(dev);
4109                         if (!idev)
4110                                 goto cont;
4111                         if (inet6_fill_ifinfo(skb, idev,
4112                                               NETLINK_CB(cb->skb).pid,
4113                                               cb->nlh->nlmsg_seq,
4114                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4115                                 goto out;
4116 cont:
4117                         idx++;
4118                 }
4119         }
4120 out:
4121         rcu_read_unlock();
4122         cb->args[1] = idx;
4123         cb->args[0] = h;
4124
4125         return skb->len;
4126 }
4127
4128 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4129 {
4130         struct sk_buff *skb;
4131         struct net *net = dev_net(idev->dev);
4132         int err = -ENOBUFS;
4133
4134         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4135         if (skb == NULL)
4136                 goto errout;
4137
4138         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4139         if (err < 0) {
4140                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4141                 WARN_ON(err == -EMSGSIZE);
4142                 kfree_skb(skb);
4143                 goto errout;
4144         }
4145         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4146         return;
4147 errout:
4148         if (err < 0)
4149                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4150 }
4151
4152 static inline size_t inet6_prefix_nlmsg_size(void)
4153 {
4154         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4155                + nla_total_size(sizeof(struct in6_addr))
4156                + nla_total_size(sizeof(struct prefix_cacheinfo));
4157 }
4158
4159 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4160                              struct prefix_info *pinfo, u32 pid, u32 seq,
4161                              int event, unsigned int flags)
4162 {
4163         struct prefixmsg *pmsg;
4164         struct nlmsghdr *nlh;
4165         struct prefix_cacheinfo ci;
4166
4167         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4168         if (nlh == NULL)
4169                 return -EMSGSIZE;
4170
4171         pmsg = nlmsg_data(nlh);
4172         pmsg->prefix_family = AF_INET6;
4173         pmsg->prefix_pad1 = 0;
4174         pmsg->prefix_pad2 = 0;
4175         pmsg->prefix_ifindex = idev->dev->ifindex;
4176         pmsg->prefix_len = pinfo->prefix_len;
4177         pmsg->prefix_type = pinfo->type;
4178         pmsg->prefix_pad3 = 0;
4179         pmsg->prefix_flags = 0;
4180         if (pinfo->onlink)
4181                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4182         if (pinfo->autoconf)
4183                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4184
4185         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4186
4187         ci.preferred_time = ntohl(pinfo->prefered);
4188         ci.valid_time = ntohl(pinfo->valid);
4189         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4190
4191         return nlmsg_end(skb, nlh);
4192
4193 nla_put_failure:
4194         nlmsg_cancel(skb, nlh);
4195         return -EMSGSIZE;
4196 }
4197
4198 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4199                          struct prefix_info *pinfo)
4200 {
4201         struct sk_buff *skb;
4202         struct net *net = dev_net(idev->dev);
4203         int err = -ENOBUFS;
4204
4205         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4206         if (skb == NULL)
4207                 goto errout;
4208
4209         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4210         if (err < 0) {
4211                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4212                 WARN_ON(err == -EMSGSIZE);
4213                 kfree_skb(skb);
4214                 goto errout;
4215         }
4216         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4217         return;
4218 errout:
4219         if (err < 0)
4220                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4221 }
4222
4223 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4224 {
4225         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4226
4227         switch (event) {
4228         case RTM_NEWADDR:
4229                 /*
4230                  * If the address was optimistic
4231                  * we inserted the route at the start of
4232                  * our DAD process, so we don't need
4233                  * to do it again
4234                  */
4235                 if (!(ifp->rt->rt6i_node))
4236                         ip6_ins_rt(ifp->rt);
4237                 if (ifp->idev->cnf.forwarding)
4238                         addrconf_join_anycast(ifp);
4239                 break;
4240         case RTM_DELADDR:
4241                 if (ifp->idev->cnf.forwarding)
4242                         addrconf_leave_anycast(ifp);
4243                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4244                 dst_hold(&ifp->rt->dst);
4245
4246                 if (ip6_del_rt(ifp->rt))
4247                         dst_free(&ifp->rt->dst);
4248                 break;
4249         }
4250 }
4251
4252 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4253 {
4254         rcu_read_lock_bh();
4255         if (likely(ifp->idev->dead == 0))
4256                 __ipv6_ifa_notify(event, ifp);
4257         rcu_read_unlock_bh();
4258 }
4259
4260 #ifdef CONFIG_SYSCTL
4261
4262 static
4263 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4264                            void __user *buffer, size_t *lenp, loff_t *ppos)
4265 {
4266         int *valp = ctl->data;
4267         int val = *valp;
4268         loff_t pos = *ppos;
4269         ctl_table lctl;
4270         int ret;
4271
4272         /*
4273          * ctl->data points to idev->cnf.forwarding, we should
4274          * not modify it until we get the rtnl lock.
4275          */
4276         lctl = *ctl;
4277         lctl.data = &val;
4278
4279         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4280
4281         if (write)
4282                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4283         if (ret)
4284                 *ppos = pos;
4285         return ret;
4286 }
4287
4288 static void dev_disable_change(struct inet6_dev *idev)
4289 {
4290         if (!idev || !idev->dev)
4291                 return;
4292
4293         if (idev->cnf.disable_ipv6)
4294                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4295         else
4296                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4297 }
4298
4299 static void addrconf_disable_change(struct net *net, __s32 newf)
4300 {
4301         struct net_device *dev;
4302         struct inet6_dev *idev;
4303
4304         rcu_read_lock();
4305         for_each_netdev_rcu(net, dev) {
4306                 idev = __in6_dev_get(dev);
4307                 if (idev) {
4308                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4309                         idev->cnf.disable_ipv6 = newf;
4310                         if (changed)
4311                                 dev_disable_change(idev);
4312                 }
4313         }
4314         rcu_read_unlock();
4315 }
4316
4317 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4318 {
4319         struct net *net;
4320         int old;
4321
4322         if (!rtnl_trylock())
4323                 return restart_syscall();
4324
4325         net = (struct net *)table->extra2;
4326         old = *p;
4327         *p = newf;
4328
4329         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4330                 rtnl_unlock();
4331                 return 0;
4332         }
4333
4334         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4335                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4336                 addrconf_disable_change(net, newf);
4337         } else if ((!newf) ^ (!old))
4338                 dev_disable_change((struct inet6_dev *)table->extra1);
4339
4340         rtnl_unlock();
4341         return 0;
4342 }
4343
4344 static
4345 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4346                             void __user *buffer, size_t *lenp, loff_t *ppos)
4347 {
4348         int *valp = ctl->data;
4349         int val = *valp;
4350         loff_t pos = *ppos;
4351         ctl_table lctl;
4352         int ret;
4353
4354         /*
4355          * ctl->data points to idev->cnf.disable_ipv6, we should
4356          * not modify it until we get the rtnl lock.
4357          */
4358         lctl = *ctl;
4359         lctl.data = &val;
4360
4361         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4362
4363         if (write)
4364                 ret = addrconf_disable_ipv6(ctl, valp, val);
4365         if (ret)
4366                 *ppos = pos;
4367         return ret;
4368 }
4369
4370 static struct addrconf_sysctl_table
4371 {
4372         struct ctl_table_header *sysctl_header;
4373         ctl_table addrconf_vars[DEVCONF_MAX+1];
4374         char *dev_name;
4375 } addrconf_sysctl __read_mostly = {
4376         .sysctl_header = NULL,
4377         .addrconf_vars = {
4378                 {
4379                         .procname       = "forwarding",
4380                         .data           = &ipv6_devconf.forwarding,
4381                         .maxlen         = sizeof(int),
4382                         .mode           = 0644,
4383                         .proc_handler   = addrconf_sysctl_forward,
4384                 },
4385                 {
4386                         .procname       = "hop_limit",
4387                         .data           = &ipv6_devconf.hop_limit,
4388                         .maxlen         = sizeof(int),
4389                         .mode           = 0644,
4390                         .proc_handler   = proc_dointvec,
4391                 },
4392                 {
4393                         .procname       = "mtu",
4394                         .data           = &ipv6_devconf.mtu6,
4395                         .maxlen         = sizeof(int),
4396                         .mode           = 0644,
4397                         .proc_handler   = proc_dointvec,
4398                 },
4399                 {
4400                         .procname       = "accept_ra",
4401                         .data           = &ipv6_devconf.accept_ra,
4402                         .maxlen         = sizeof(int),
4403                         .mode           = 0644,
4404                         .proc_handler   = proc_dointvec,
4405                 },
4406                 {
4407                         .procname       = "accept_redirects",
4408                         .data           = &ipv6_devconf.accept_redirects,
4409                         .maxlen         = sizeof(int),
4410                         .mode           = 0644,
4411                         .proc_handler   = proc_dointvec,
4412                 },
4413                 {
4414                         .procname       = "autoconf",
4415                         .data           = &ipv6_devconf.autoconf,
4416                         .maxlen         = sizeof(int),
4417                         .mode           = 0644,
4418                         .proc_handler   = proc_dointvec,
4419                 },
4420                 {
4421                         .procname       = "dad_transmits",
4422                         .data           = &ipv6_devconf.dad_transmits,
4423                         .maxlen         = sizeof(int),
4424                         .mode           = 0644,
4425                         .proc_handler   = proc_dointvec,
4426                 },
4427                 {
4428                         .procname       = "router_solicitations",
4429                         .data           = &ipv6_devconf.rtr_solicits,
4430                         .maxlen         = sizeof(int),
4431                         .mode           = 0644,
4432                         .proc_handler   = proc_dointvec,
4433                 },
4434                 {
4435                         .procname       = "router_solicitation_interval",
4436                         .data           = &ipv6_devconf.rtr_solicit_interval,
4437                         .maxlen         = sizeof(int),
4438                         .mode           = 0644,
4439                         .proc_handler   = proc_dointvec_jiffies,
4440                 },
4441                 {
4442                         .procname       = "router_solicitation_delay",
4443                         .data           = &ipv6_devconf.rtr_solicit_delay,
4444                         .maxlen         = sizeof(int),
4445                         .mode           = 0644,
4446                         .proc_handler   = proc_dointvec_jiffies,
4447                 },
4448                 {
4449                         .procname       = "force_mld_version",
4450                         .data           = &ipv6_devconf.force_mld_version,
4451                         .maxlen         = sizeof(int),
4452                         .mode           = 0644,
4453                         .proc_handler   = proc_dointvec,
4454                 },
4455 #ifdef CONFIG_IPV6_PRIVACY
4456                 {
4457                         .procname       = "use_tempaddr",
4458                         .data           = &ipv6_devconf.use_tempaddr,
4459                         .maxlen         = sizeof(int),
4460                         .mode           = 0644,
4461                         .proc_handler   = proc_dointvec,
4462                 },
4463                 {
4464                         .procname       = "temp_valid_lft",
4465                         .data           = &ipv6_devconf.temp_valid_lft,
4466                         .maxlen         = sizeof(int),
4467                         .mode           = 0644,
4468                         .proc_handler   = proc_dointvec,
4469                 },
4470                 {
4471                         .procname       = "temp_prefered_lft",
4472                         .data           = &ipv6_devconf.temp_prefered_lft,
4473                         .maxlen         = sizeof(int),
4474                         .mode           = 0644,
4475                         .proc_handler   = proc_dointvec,
4476                 },
4477                 {
4478                         .procname       = "regen_max_retry",
4479                         .data           = &ipv6_devconf.regen_max_retry,
4480                         .maxlen         = sizeof(int),
4481                         .mode           = 0644,
4482                         .proc_handler   = proc_dointvec,
4483                 },
4484                 {
4485                         .procname       = "max_desync_factor",
4486                         .data           = &ipv6_devconf.max_desync_factor,
4487                         .maxlen         = sizeof(int),
4488                         .mode           = 0644,
4489                         .proc_handler   = proc_dointvec,
4490                 },
4491 #endif
4492                 {
4493                         .procname       = "max_addresses",
4494                         .data           = &ipv6_devconf.max_addresses,
4495                         .maxlen         = sizeof(int),
4496                         .mode           = 0644,
4497                         .proc_handler   = proc_dointvec,
4498                 },
4499                 {
4500                         .procname       = "accept_ra_defrtr",
4501                         .data           = &ipv6_devconf.accept_ra_defrtr,
4502                         .maxlen         = sizeof(int),
4503                         .mode           = 0644,
4504                         .proc_handler   = proc_dointvec,
4505                 },
4506                 {
4507                         .procname       = "accept_ra_pinfo",
4508                         .data           = &ipv6_devconf.accept_ra_pinfo,
4509                         .maxlen         = sizeof(int),
4510                         .mode           = 0644,
4511                         .proc_handler   = proc_dointvec,
4512                 },
4513 #ifdef CONFIG_IPV6_ROUTER_PREF
4514                 {
4515                         .procname       = "accept_ra_rtr_pref",
4516                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4517                         .maxlen         = sizeof(int),
4518                         .mode           = 0644,
4519                         .proc_handler   = proc_dointvec,
4520                 },
4521                 {
4522                         .procname       = "router_probe_interval",
4523                         .data           = &ipv6_devconf.rtr_probe_interval,
4524                         .maxlen         = sizeof(int),
4525                         .mode           = 0644,
4526                         .proc_handler   = proc_dointvec_jiffies,
4527                 },
4528 #ifdef CONFIG_IPV6_ROUTE_INFO
4529                 {
4530                         .procname       = "accept_ra_rt_info_max_plen",
4531                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4532                         .maxlen         = sizeof(int),
4533                         .mode           = 0644,
4534                         .proc_handler   = proc_dointvec,
4535                 },
4536 #endif
4537 #endif
4538                 {
4539                         .procname       = "proxy_ndp",
4540                         .data           = &ipv6_devconf.proxy_ndp,
4541                         .maxlen         = sizeof(int),
4542                         .mode           = 0644,
4543                         .proc_handler   = proc_dointvec,
4544                 },
4545                 {
4546                         .procname       = "accept_source_route",
4547                         .data           = &ipv6_devconf.accept_source_route,
4548                         .maxlen         = sizeof(int),
4549                         .mode           = 0644,
4550                         .proc_handler   = proc_dointvec,
4551                 },
4552 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4553                 {
4554                         .procname       = "optimistic_dad",
4555                         .data           = &ipv6_devconf.optimistic_dad,
4556                         .maxlen         = sizeof(int),
4557                         .mode           = 0644,
4558                         .proc_handler   = proc_dointvec,
4559
4560                 },
4561 #endif
4562 #ifdef CONFIG_IPV6_MROUTE
4563                 {
4564                         .procname       = "mc_forwarding",
4565                         .data           = &ipv6_devconf.mc_forwarding,
4566                         .maxlen         = sizeof(int),
4567                         .mode           = 0444,
4568                         .proc_handler   = proc_dointvec,
4569                 },
4570 #endif
4571                 {
4572                         .procname       = "disable_ipv6",
4573                         .data           = &ipv6_devconf.disable_ipv6,
4574                         .maxlen         = sizeof(int),
4575                         .mode           = 0644,
4576                         .proc_handler   = addrconf_sysctl_disable,
4577                 },
4578                 {
4579                         .procname       = "accept_dad",
4580                         .data           = &ipv6_devconf.accept_dad,
4581                         .maxlen         = sizeof(int),
4582                         .mode           = 0644,
4583                         .proc_handler   = proc_dointvec,
4584                 },
4585                 {
4586                         .procname       = "force_tllao",
4587                         .data           = &ipv6_devconf.force_tllao,
4588                         .maxlen         = sizeof(int),
4589                         .mode           = 0644,
4590                         .proc_handler   = proc_dointvec
4591                 },
4592                 {
4593                         /* sentinel */
4594                 }
4595         },
4596 };
4597
4598 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4599                 struct inet6_dev *idev, struct ipv6_devconf *p)
4600 {
4601         int i;
4602         struct addrconf_sysctl_table *t;
4603
4604 #define ADDRCONF_CTL_PATH_DEV   3
4605
4606         struct ctl_path addrconf_ctl_path[] = {
4607                 { .procname = "net", },
4608                 { .procname = "ipv6", },
4609                 { .procname = "conf", },
4610                 { /* to be set */ },
4611                 { },
4612         };
4613
4614
4615         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4616         if (t == NULL)
4617                 goto out;
4618
4619         for (i = 0; t->addrconf_vars[i].data; i++) {
4620                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4621                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4622                 t->addrconf_vars[i].extra2 = net;
4623         }
4624
4625         /*
4626          * Make a copy of dev_name, because '.procname' is regarded as const
4627          * by sysctl and we wouldn't want anyone to change it under our feet
4628          * (see SIOCSIFNAME).
4629          */
4630         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4631         if (!t->dev_name)
4632                 goto free;
4633
4634         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4635
4636         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4637                         t->addrconf_vars);
4638         if (t->sysctl_header == NULL)
4639                 goto free_procname;
4640
4641         p->sysctl = t;
4642         return 0;
4643
4644 free_procname:
4645         kfree(t->dev_name);
4646 free:
4647         kfree(t);
4648 out:
4649         return -ENOBUFS;
4650 }
4651
4652 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4653 {
4654         struct addrconf_sysctl_table *t;
4655
4656         if (p->sysctl == NULL)
4657                 return;
4658
4659         t = p->sysctl;
4660         p->sysctl = NULL;
4661         unregister_net_sysctl_table(t->sysctl_header);
4662         kfree(t->dev_name);
4663         kfree(t);
4664 }
4665
4666 static void addrconf_sysctl_register(struct inet6_dev *idev)
4667 {
4668         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4669                               &ndisc_ifinfo_sysctl_change);
4670         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4671                                         idev, &idev->cnf);
4672 }
4673
4674 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4675 {
4676         __addrconf_sysctl_unregister(&idev->cnf);
4677         neigh_sysctl_unregister(idev->nd_parms);
4678 }
4679
4680
4681 #endif
4682
4683 static int __net_init addrconf_init_net(struct net *net)
4684 {
4685         int err;
4686         struct ipv6_devconf *all, *dflt;
4687
4688         err = -ENOMEM;
4689         all = &ipv6_devconf;
4690         dflt = &ipv6_devconf_dflt;
4691
4692         if (!net_eq(net, &init_net)) {
4693                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4694                 if (all == NULL)
4695                         goto err_alloc_all;
4696
4697                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4698                 if (dflt == NULL)
4699                         goto err_alloc_dflt;
4700         } else {
4701                 /* these will be inherited by all namespaces */
4702                 dflt->autoconf = ipv6_defaults.autoconf;
4703                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4704         }
4705
4706         net->ipv6.devconf_all = all;
4707         net->ipv6.devconf_dflt = dflt;
4708
4709 #ifdef CONFIG_SYSCTL
4710         err = __addrconf_sysctl_register(net, "all", NULL, all);
4711         if (err < 0)
4712                 goto err_reg_all;
4713
4714         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4715         if (err < 0)
4716                 goto err_reg_dflt;
4717 #endif
4718         return 0;
4719
4720 #ifdef CONFIG_SYSCTL
4721 err_reg_dflt:
4722         __addrconf_sysctl_unregister(all);
4723 err_reg_all:
4724         kfree(dflt);
4725 #endif
4726 err_alloc_dflt:
4727         kfree(all);
4728 err_alloc_all:
4729         return err;
4730 }
4731
4732 static void __net_exit addrconf_exit_net(struct net *net)
4733 {
4734 #ifdef CONFIG_SYSCTL
4735         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4736         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4737 #endif
4738         if (!net_eq(net, &init_net)) {
4739                 kfree(net->ipv6.devconf_dflt);
4740                 kfree(net->ipv6.devconf_all);
4741         }
4742 }
4743
4744 static struct pernet_operations addrconf_ops = {
4745         .init = addrconf_init_net,
4746         .exit = addrconf_exit_net,
4747 };
4748
4749 /*
4750  *      Device notifier
4751  */
4752
4753 int register_inet6addr_notifier(struct notifier_block *nb)
4754 {
4755         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4756 }
4757 EXPORT_SYMBOL(register_inet6addr_notifier);
4758
4759 int unregister_inet6addr_notifier(struct notifier_block *nb)
4760 {
4761         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4762 }
4763 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4764
4765 static struct rtnl_af_ops inet6_ops = {
4766         .family           = AF_INET6,
4767         .fill_link_af     = inet6_fill_link_af,
4768         .get_link_af_size = inet6_get_link_af_size,
4769 };
4770
4771 /*
4772  *      Init / cleanup code
4773  */
4774
4775 int __init addrconf_init(void)
4776 {
4777         int i, err;
4778
4779         err = ipv6_addr_label_init();
4780         if (err < 0) {
4781                 printk(KERN_CRIT "IPv6 Addrconf:"
4782                        " cannot initialize default policy table: %d.\n", err);
4783                 goto out;
4784         }
4785
4786         err = register_pernet_subsys(&addrconf_ops);
4787         if (err < 0)
4788                 goto out_addrlabel;
4789
4790         /* The addrconf netdev notifier requires that loopback_dev
4791          * has it's ipv6 private information allocated and setup
4792          * before it can bring up and give link-local addresses
4793          * to other devices which are up.
4794          *
4795          * Unfortunately, loopback_dev is not necessarily the first
4796          * entry in the global dev_base list of net devices.  In fact,
4797          * it is likely to be the very last entry on that list.
4798          * So this causes the notifier registry below to try and
4799          * give link-local addresses to all devices besides loopback_dev
4800          * first, then loopback_dev, which cases all the non-loopback_dev
4801          * devices to fail to get a link-local address.
4802          *
4803          * So, as a temporary fix, allocate the ipv6 structure for
4804          * loopback_dev first by hand.
4805          * Longer term, all of the dependencies ipv6 has upon the loopback
4806          * device and it being up should be removed.
4807          */
4808         rtnl_lock();
4809         if (!ipv6_add_dev(init_net.loopback_dev))
4810                 err = -ENOMEM;
4811         rtnl_unlock();
4812         if (err)
4813                 goto errlo;
4814
4815         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4816                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4817
4818         register_netdevice_notifier(&ipv6_dev_notf);
4819
4820         addrconf_verify(0);
4821
4822         err = rtnl_af_register(&inet6_ops);
4823         if (err < 0)
4824                 goto errout_af;
4825
4826         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4827                               NULL);
4828         if (err < 0)
4829                 goto errout;
4830
4831         /* Only the first call to __rtnl_register can fail */
4832         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4833         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4834         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4835                         inet6_dump_ifaddr, NULL);
4836         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4837                         inet6_dump_ifmcaddr, NULL);
4838         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4839                         inet6_dump_ifacaddr, NULL);
4840
4841         ipv6_addr_label_rtnl_register();
4842
4843         return 0;
4844 errout:
4845         rtnl_af_unregister(&inet6_ops);
4846 errout_af:
4847         unregister_netdevice_notifier(&ipv6_dev_notf);
4848 errlo:
4849         unregister_pernet_subsys(&addrconf_ops);
4850 out_addrlabel:
4851         ipv6_addr_label_cleanup();
4852 out:
4853         return err;
4854 }
4855
4856 void addrconf_cleanup(void)
4857 {
4858         struct net_device *dev;
4859         int i;
4860
4861         unregister_netdevice_notifier(&ipv6_dev_notf);
4862         unregister_pernet_subsys(&addrconf_ops);
4863         ipv6_addr_label_cleanup();
4864
4865         rtnl_lock();
4866
4867         __rtnl_af_unregister(&inet6_ops);
4868
4869         /* clean dev list */
4870         for_each_netdev(&init_net, dev) {
4871                 if (__in6_dev_get(dev) == NULL)
4872                         continue;
4873                 addrconf_ifdown(dev, 1);
4874         }
4875         addrconf_ifdown(init_net.loopback_dev, 2);
4876
4877         /*
4878          *      Check hash table.
4879          */
4880         spin_lock_bh(&addrconf_hash_lock);
4881         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4882                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4883         spin_unlock_bh(&addrconf_hash_lock);
4884
4885         del_timer(&addr_chk_timer);
4886         rtnl_unlock();
4887 }